NLN PAX Science Exam 2023 Scored A+

NLN PAX Science Exam 2023 Scored A+ A person blows his breath into a straw that is placed in limewater. The limewater becomes cloudy because the person's breath contains A.) carbon dioxide. B.) hydrogen. C.) oxygen. D.) nitrogen. Correct answer: carbon dioxide. A physician measures the pulse and blood pressure (BP) of all patients on a routine basis. Which of these measurements show the normal BP values for a resting adult patient? A.) 125/95 mm Hg B.) 120/80 mm Hg C.) 100/80 mm Hg D.) 72/120 mm Hg Correct answer: 120/80 mm Hg A woman suddenly chokes on a piece of food and clutches frantically at her throat. An immediate remedy is to A.) have her bend forward and tell her to cough. B.) insert a finger or a blunt object toward the back of the mouth. C.) apply quick, hard pressures successively to her abdomen, just beneath her diaphragm. D.) phone "emergency" for help. Correct answer: apply quick, hard pressures successively to her abdomen, just beneath her diaphragm. An unknown gas is more dense than air, does not support combustion, and turns a limewater solution cloudy. This gas is most probably A.) ammonia. B.) methane. C.) carbon dioxide. C.) hydrogen. Correct answer: carbon dioxide. Human testes produce A.) eggs. B.) follicle stimulating hormone. C.) growth hormone. D.) spermatozoa. Correct answer: spermatozoa. If a red light is passed through a dilute solution of chlorophyll solution, the spectrophotometer will detect what amount of transmittance of this light? A.) 100% B.) 50 - 75% C.) Less than 25% D.) None Correct answer: 50 - 75% In diagnostic testing, the electroencephalogram permits the physician to A.) examine the impulses of the specialized muscle cells of the heart. B.) examine the impulses of the nerve cells within the brain. C.) measure the pressure within the eye. D.) measure the amount of air upon exhalation. Correct answer: examine the impulses of the nerve cells within the brain. To sterilize a metal probe in the office, a dentist could use a steam sterilizer. If unavailable, the next most effective method to sterilize the instrument would be A.) boiling it in water for 15 minutes. B.) dipping it into a concentrated acid solution. C.) heating it in a hot air oven at 160°C for 20 minutes. D.) washing it in soap and water. Correct answer: boiling it in water for 15 minutes. In varieties of matter, the term heterogeneous may be applied to A.) elements, but not compounds. B.) compounds, but not elements. C.) compounds and elements, but not mixtures. D.) mixtures, but not elements or compounds. Correct answer: mixtures, but not elements or compounds. Heat energy is absorbed in which of these phase changes? A.) Br2 (l) -> Br2(s) B.) Br2 (g) --> Br2(l) C.) Br2 (l) -> Br2(g) D.) Br2 (g) -> Br2(s) Correct answer: Br2 (l) -> Br2(g) Periodontitis is an inflammatory condition of the A.) gum tissue that surrounds the neck of each tooth. B.) pulp that contains nerve cells and blood vessels of the tooth. C.) dentin that surrounds the soft part of a tooth. D.) enamel that provides a hard surface for chewing. Correct answer: gum tissue that surrounds the neck of each tooth. The atoms of an element with seven valence electrons are most probably classified as A.) metals. B.) nonmetals. C.) metalloids. D.) noble gases. Correct answer: nonmetals. The inherited factors that are transmitted in an organism from generation to generation are called its A.) homozygote. B.) heterozygote. C.) genotype. D.) phenotype. Correct answer: genotype. The process of nuclear cell division in the cell reproduction of plants differs from mammals. A major difference is that A.) homologous chromosomes are paired. B.) centrioles are replicated. C.) spindle fibers are missing. D.) cell plates are synthesized. Correct answer: cell plates are synthesized. Unicellular organisms that have a nucleus and can swim with the aid of cilia are examples of A.) monerans. B.) plants. C.) fungi. D.) protozoans. Correct answer: protozoans. Which of these conditions is associated with smoking? A.) Esophageal varices. B.) Tonsillitis. C.) Emphysema. D.) Blindness. Correct answer: Emphysema. Which of these equations best illustrates a synthesis reaction? A.) 2Na + Cl2 -> 2NaCl B.) NaOH + HCl -> NaCl + H2O C.) 2H2O2 -> 2H2O + O2 D.) CH4 + 2O2 -> CO2 + 2H2O Correct answer: 2Na + Cl2 -> 2NaCl Which of these hydrocarbons is a member of the benzene family? A.) Toluene. B.) Ethyne. C.) Propanone. D.) Methanol. Correct answer: Toluene. Which of these quantities is most closely associated with an object's inertia? A.) Weight. B.) Energy. C.) Power. D.) Mass. Correct answer: Mass Which of these sequences of anatomic organization, from the simplest level to the most complex, is the correct sequence? A.) From tissue, organ, organ system to organism. B.) From organ system, organ, tissue to organism. C.) From tissue, organ system, organ to organism. D.) From organ, organ system, tissue to organism. Correct answer: From tissue, organ, organ system to organism Which of these single instruments may be used to measure the current flowing through a circuit? A.) A voltmeter. B.) An ammeter. C.) A potentiometer. D.) An ohmmeter. Correct answer: An ammeter. Which of these temperatures is known as Absolute Zero? A.) 0°C B.) 0 K C.) positive 273°C D.) negative 273 K Correct answer: 0 K Which part of the human central nervous system controls voluntary movements? A.) Spinal cord. B.) Cerebellum. C.) Cerebrum. D.) Medulla. Correct answer: Cerebrum. Within which of these structures of the female reproductive tract is the human egg fertilized? A.) Uterus. B.) Fallopian tube. C.) Vagina. D.) Cervix. Correct answer: Fallopian tube. You cut your finger rather deeply while slicing an apple. Which of these actions should you take first? A.) Apply a sterile adhesive bandage. B.) Press the cut surface to stop the flow of blood. C.) Swab the wound with mild antiseptic. D.) Wash the wound continuously with cold running water. Correct answer: Wash the wound continuously with cold running water. A lens that focuses distant light to a single point is known as a A.) converging lens. B.) diverging lens. C.) concave lens. D.) prismatic lens. Correct answer: converging lens. A magician rapidly pulls a tablecloth from a table, leaving the dishes undisturbed. Which of these principles of physics explains this "trick"? A.) Gravitational force depends directly on mass. B.) Objects at rest tend to remain at rest. C.) Force equals mass times acceleration. D.) An object traveling at constant velocity has no net force on it. Correct answer: Objects at rest tend to remain at rest. A quantity that has both magnitude and direction is called a(n) A.) resultant. B.) scalar. C.) vector. D.) undefined unit. Correct answer: vector. A recently discovered species has these characteristics: amniotic eggs, a four-chambered heart, and lightweight, honeycombed bones. Which of these ADDITIONAL characteristics is likely to be present? A.) Mammary glands. B.) External fertilization. C.) Ectotherms. D.) Feathers for flying. Correct answer: Feathers for flying. Amnesia in humans is the loss of memory. Which of these parts of the brain has been affected when someone is suffering from amnesia caused by head trauma? A.) Cerebral cortex. B.) Cerebellum. C.) Medulla oblongata. D.) Spinal cord. Correct answer: Cerebral cortex. An example of the most complex level of organization in a frog is the A.) epithelium. B.) striated muscle. C.) respiratory system. D.) stomach. Correct answer: respiratory system. Anaerobic respiration occurs in muscle tissue when it cannot get sufficient oxygen to function aerobically. Which of these conditions is most likely to directly result from this? A.) Cramps. B.) Necrosis. C.) Bleeding. D.) Swelling. Correct answer: Cramps Enzymes that are involved in biochemical reactions are organic A.) colloids. B.) catalysts. C.) cathodes. D.) constants. Correct answer: Catalysts In a study on the effect of cocaine on the brains of rats, two groups of animals were selected. Each day, Group A was injected with the drug dissolved in water, whereas Group B was injected with water alone. In such a study Group B is included as A.) an experimental group. B.) a test group. C.) an exercise group. D.) a control group. Correct answer: a control group. In corn plants, the gene that codes for the presence of chlorophyll is sometimes missing. The resulting seedlings are albino and will not survive. This lethal gene appears in corn populations because A.) the soil nutrients will not allow the plant to produce chlorophyll. B.) the parent plants that produced the seeds carried the recessive gene for the albino trait. C.) the farmer used herbicides, which destroyed the chlorophyll in the seedlings. D.) the seeds were old and stored improperly, resulting in the lethal trait. Correct answer: the parent plants that produced the seeds carried the recessive gene for the albino trait In the reaction of iron with water shown below, what coefficient must be placed before the iron (Fe) to balance the reaction? Fe + 4H2O ° Fe3O4 + 4H2 A.) 2 B.) 3 C.) 4 D.) 6 Correct answer: 3 A circuit contains three 3-ohm (W) resistors in series. What is the equivalent resistance of this combination? Correct answer: 9W An example of an adaptation to prevent water loss in plants is Correct answer: waxy epidermis At room temperature, which of these substances exists as diatomic molecules? Correct answer: oxygen Compounds with the same type and number of atoms and the same chemical bonds but different spatial arrangements of these bonds and atoms are called Correct answer: structural isomers. The calorie and the kilocalorie are units of Correct answer: energy The force of gravity on an object is that object's Correct answer: weight The light sensitive cells of the eye are called rods and cones. Which of these layers of the eye are they found in? Correct answer: retina The meiotic division of cells leads to the production of cells that Correct answer: contain half the usual number of chromosomes. The most probable area of study that would show the prevalence of mental illness in mid-Manhattan is that of Correct answer: epidemiology The normal boiling temperature for water is 100° when measured on which of these scales? Correct answer: celsius What is the pH of a solution whose H+ ion concentration is 1 x 10-2 mole per liter? Correct answer: 2 When a column of air is vibrating at the same rate as a tuning fork, the process is referred to as Correct answer: resonance When a population is in Hardy-Weinberg equilibrium, which of these conditions must be present? Correct answer: The population is isolated from other populations. When three resistors of 10.0 ohms each are placed in series, the total resistance is Correct answer: 30.0 ohms Which of these changes occurs in the kidneys when a person becomes dehydrated? Correct answer: The filtration rate of water remains constant and the reabsorption of water increases. Which of these could be stopped by a sheet of paper? Correct answer: Alpha particle Which of these is an example of a simple machine? Correct answer: lever, pulley, inclined plane Which of these organisms might be found in contaminated well water? Correct answer: Giardia Which of these processes occurs at a neuromuscular junction? Correct answer: Impulse transmission. 1 kilogram (kg) of solid X at 10°C and 1 kg of solid Y at 10°C each absorb 5 joules of heat energy. The final temperatures of X and Y are 15°C and 20°C, respectively. Compared to X, Y must have a lower Correct answer: specific heat A drop of dilute ammonium hydroxide (NH4OH) is placed on one side of a slide containing a large number of swimming paramecium. Under this condition, which of these behaviors of the paramecia will be observed? Correct answer: They will eventually all swim away from the ammonium hydroxide. A physician measures the pulse and blood pressure (BP) of all patients on a routine basis. Which of these measurements show the normal BP values for a resting adult patient? Correct answer: 120/.80 mmHg Which of these processes is responsible for the recorded production of CO2 by yeast cells from sugar solution? Correct answer: anaerobic respiration In classical physics, light is viewed as part of the electromagnetic spectrum, traveling in the form of transverse waves. Quantum physics proposes that light is composed of quanta called Correct answer: photons Enzymes that are involved in biochemical reactions are organic Correct answer: catalysts How much current is drawn by a light bulb that has a resistance of 100 R with a voltage of 110 V? (V = IR) Correct answer: 1.1 amperes Sodium will react most readily with Correct answer: chlorine The watt is a unit of Correct answer: power The boiling point of liquid nitrogen at one atmosphere pressure is 77 K. This temperature is equivalent to. Correct answer: - 196 C The energy associated with an object's position is termed Correct answer: potential energy The extension of a neuron that carries the impulse to another cell is called Correct answer: axon What is the correct sequence in the life cycle of a moth? Correct answer: Egg, larva, pupa, adult. When water passes from a region of greater concentration to a region of lesser concentration through a selectively permeable membrane, the process is known as Correct answer: osmosis Which of these experiments would be an effective way to determine the distribution of touch receptors in the skin? Correct answer: Have a blindfolded student tell when a bristle placed lightly against the skin is felt. Which of these processes is used to free contaminated water of bacteria? Correct answer: Passing it through charcoal. Which of these structures produces sperm cells in human males? Correct answer: testes What is a gram stain? Correct answer: an important technique used in the laboratory thatdistinguishes between different kinds of bacterial cell walls. Reducing the use of aeresol cans has contributed to the decrease of? Correct answer: the destruction of the ozone layer The atomic number of flourine is 9. How many electrons are contained in the second principal energy level of a flourine atom in the ground state? Correct answer: 7 The second law of thermodynamics states that with every spontaneous process, the entropy of the universe Correct answer: increases When blood is filtered in the kidney and urine is produced, red blood cells and plasma proteins do not pass through the blood capillaries. This occurs because Correct answer: blood and plasma proteins are needed by the body, so they do not get filtered out into the kidney. Which of these germ layers gives rise to the skin? Correct answer: ectoderm A material that settles out of a reaction is termed a Correct answer: colloid According to the Ideal Gas Equation (PV = nRT), if the temperature and amount of gas are kept constant, what will be the effect of an increase in pressure on the volume of a gas? Correct answer: As the pressure increases, the volume decreases. All living cells contain cytoplasm. Cytoplasm is important because it Correct answer: controls what moves in and out of the cell. All of these groups of land plants produce seeds EXCEPT Correct answer: evergreen trees, such as pines and spruces. Charles Darwin's theory of evolution suggests that the reason for the various differences between species is a result of Correct answer: natural selection In order to observe the endoplasmic reticulum in a cell, a scientist would use Correct answer: an electron microscope Scientists have discovered that most vertebrates have cone cells in their eyes, which distinguish colors in daylight. The rods are more sensitive to light, but do not distinguish colors. If a mammal is nocturnal Correct answer: there are fewer cones and a greater concentration of rods to collect the minimal light for night vision. The functional group present in all alcohols is the Correct answer: hydroxyl group The scientific name of the wolf is Canis lupus. The name indicates the wolf's Correct answer: genus and species The weight of an adult human in newtons (N) is closest to Correct answer: 500 N When two atoms share a pair of electrons, the bond between them is called Correct answer: covalent When a sperm and egg join to form a zygote in humans, what determines the sex of the child that is produced? Correct answer: sperm Which of these arrangements of atoms is found in all alcohols? Correct answer: C-OH Which of these units is associated with magnitude, but not direction? Correct answer: Time Which aspect of a simple machine is represented by the ratio work output to work input? Correct answer: Actual mechanical advantage. 30 students in a class carefully measure the length and width of 20 peanut shells. They also count the number and note the size of the peanuts inside. This information is recorded on various graphs showing the numbers of nuts and the different sizes. The collected evidence of the peanuts gives the students an idea of the extent of Correct answer: variation within a species. A lens that focuses distant light to a single point is known as a Correct answer: converging lens. During exercise, a person's respiratory rate increases due to Correct answer: an increase in CO2 concentration in the blood. Ganglia are made up of a cluster of Correct answer: neurons. To determine the optimum conditions for the activity of a digestive enzyme, it would be necessary to test its activity over a range of Correct answer: temperature, pH and substrate concentration. Which of these findings suggests a serious illness from a urinalysis? Correct answer: Presence of glucose and protein. As part of the human immune response, which of these cells are responsible for producing antibodies? Correct answer: lymphocytes A cell which manufactures a large amount of protein for export would have an abundance of organelles called Correct answer: ribosomes A lab technician has the choice of four different enzymes to use in an experiment that will run at 25°C. The optimal temperatures of enzymes using the Kelvin scale are: Enzyme A: 273 K, Enzyme B: 298 K, Enzyme C: 310 K, Enzyme D: 325 K. Which enzyme would be the best to use in this experiment? Correct answer: Enzyme B If a person is fasting for 24 hours and ingests no carbohydrates, the liver will provide for the body's need by Correct answer: converting glycogen into glucose. The physics principle that is primarily used in developing a rollercoaster ride is Correct answer: centripetal force Whole blood of type AB can be transfused to people with which of these types of blood? Correct answer: AB only Which of these organ systems does NOT provide for the excretion of substances? Correct answer: lymphatic Which of these processes is illustrated by the spreading out of ammonia vapor in a closed room? Correct answer: Diffusion Which human body system does meiosis occur in? Correct answer: reproductive Which biochemical family do starch and glycogen belong in? Correct answer: carbohydrates The succession of flora and fauna encountered while climbing a mountain in the northern hemisphere is similar to that found when traveling from the base of the same mountain in which of these general directions? Correct answer: North When steel wool (mostly iron) burns, its mass increases. The best explanation of this observation is that Correct answer: the iron oxide formed has more mass than the iron alone. The number of complete waves which pass a point in one second is known as a Correct answer: frequency An example of an adaptation to prevent water loss in plants is Correct answer: waxy epidermis A circuit contains three 3-ohm (W) resistors in series. What is the equivalent resistance of this combination? Correct answer: 9 W Which of these quantities is a vector quantity? Correct answer: force Which of these substances carries energy within cells and is produced as a result of cellular respiration Correct answer: ATP Which of the structures contains valves to prevent blood from flowing in the wrong direction? Correct answer: veins Which of these is an example of a simple machine? Correct answer: all of the above When three resistors of 10.0 ohms each are placed in series, the total resistance is Correct answer: 30.0 ohms When a drop of dilute nitric acid is added to water surrounding a hydra, the animal draws in its tentacles. The acid is acting as Correct answer: a stimulus When a column of air is vibrating at the same rate as a tuning fork, the process is referred to as Correct answer: Resonance Scientists have discovered that most vertebrates have cone cells in their eyes, which distinguishes colors in daylight. The rods are more sensitive to light, but do not distinguish colors. If a mammal is nocturnal Correct answer: There are fewer cones and a greater concentration of rods to collect the minimal light for night vision In a study on the effects of cocaine on the brains of rats, two groups of animals were selected. Each day, Group A was injected with the drug dissolved in water, whereas the Group B was injected with water alone. In such a study group B is included as Correct answer: A control group If blue light emits electrons from a photosensitive surface, then electrons must also be emitted it by Correct answer: Ultraviolet light If all of the second-order consumers within an ecosystem of a region were removed, the most likely short-term effect would be Correct answer: An increase in the number of first-order consumers During exercise, a person's respiratory rate increases due to Correct answer: An increase in CO2 concentration in the blood Anaerobic respiration occurs in muscle tissue when it cannot get sufficient oxygen to function aerobically. Which of these conditions is most likely to directly result from this? Correct answer: Cramps Amnesia in humans is the loss of memory. Which of these parts of the brain has been affected when someone is suffering from amnesia caused by head trauma? Correct answer: Cerebral cortex A quantity that has both magnitude and direction is called a(n) Correct answer: vector Which of these equations best illustrates a synthesis reaction? Correct answer: 2Na + CI2 -> 2NaCI He energy is absorbed in which of these phase changes? Correct answer: Br2 (l) -> Br2(g) A student focuses sunlight to a point with a thin converging (convex) lens. Which of these direct measurement can the student make as a result of this experiment? Correct answer: The approximate focal length of the lens Guard cells which can be found in the leaves of plants are most closely associated with which of these processes? Correct answer: Evaporation of water from the plant A drop of dilute ammonium hydroxide (NH4OH) pIs placed on one side of the slide containing a large number of swimming paramecium. Under this condition, which of these behaviors of the paramecia will be observed? Correct answer: They will all eventually swim away from the ammonium hydroxide. Which of these organisms might be found in contaminated well water? Correct answer: Giardia Which of this is an example of an emulsion? Correct answer: Mayonnaise When your muscles atrophy, they Correct answer: waste away Which of these instruments is used to measure the amount of heat exchanged in a system? Correct answer: Calorimeter When a population is in Hardey-Weinberg equilibrium, which of these conditions must be present? Correct answer: The population is isolated from other populations. Water freezes at 0°C. On the Kelvin temperature scale, this is equivalent to Correct answer: 273 K The region of the brain most concerned with coordinating somatic motor function is the Correct answer: Cerebellum The law of dominance was proposed by which of the following scientists? Correct answer: Mendel The function of the myelin sheath That's surrounds many neurons is to Correct answer: Increase the rate of impulse transport Most internal gas exchanges in the human respiratory tract occurs across the capillaries of which of these structures? Correct answer: Alveoli How much current is drawn by a lightbulb that has a resistance of 100 R with the voltage of 110 V? (V = IR) Correct answer: 1.1 amperes Which of these particles can only be found in the nucleus of an atom? Correct answer: Protons and neutrons Unicellular organisms that have a nucleus and can swim with the aid of cilia are examples of Correct answer: Protozoans The process of nuclear cell division in the cell reproduction of plants differ from mammals. A major difference is that Correct answer: Cell plates are synthesized The inherited factors that are transmitted in an organism from generation to generation are called its A.) DNA B.) genotype C.) Correct answer: Genotype The bending of a wave around an obstacle is known as A.) diffraction. B.) deflection. C.) refraction. D.) reflection. Correct answer: Diffraction Iodize salt is used to prevent a human condition known as A.) rickets. B.) goiter. C.) scurvy. D.) beri-beri Correct answer: goiter In varieties of matter, the term heterogeneous may be applied to A.) elements, but not compounds. B.) compounds, but not elements. C.) compounds and elements, but not mixtures. D.) mixtures, but not elements or compounds. Correct answer: Mixtures, but not elements or compounds. Night blindness in humans is caused by a lack of A.) Vitamin A. B.) Niacin. C.) Calcium. D.) Vitamin D Correct answer: vitamin A The energy associated with an object's position is termed A.) kinetic energy. B.) thermal energy. C.) photon energy. D.) potential energy. Correct potential energy. The full set of genes in an individual is known as A.) specific DNA. B.) the human genome. C.) a chromosomal pattern. D.) cellular identity. Correct answer: The human genome The Pap test can detect cancer in the female reproductive tract at an early stage, requiring cells scraped from A.) the vagina. B.) the fallopian tubes. C.) the uterus. D.) the cervix. Correct answer: the cervix. When blood is filtered in the kidney and urine is produced, red blood cells and plasma proteins do not pass through the blood capillaries. This occurs because A.) the cell membrane of the capillary does not allow any substance to pass through it. B.) large molecules such as blood and plasma proteins do not fit through the permeable membrane, so they cannot enter the tubules in the kidney. C.) blood and plasma proteins are needed by the body, so they do not get filtered out into the kidney. D.) urine is composed of urea and water, so these are the only substances that will pass through the capillary membrane into the kidneys. Correct answer: large molecules such as blood and plasma proteins do not fit through the permeable membrane, so they cannot enter the tubules in the kidney When three resistors of 10.0 ohms each are placed in series, the total resistance is A.) 3.3 ohms. B.) 10.0 ohms. C.) 30.0 ohms. D.) 40.6 ohms. Correct 30.0 ohms When your muscles atrophy, they A.) waste away. B.) stiffen up. C.) become fatigued. D.) gain strength. Correct answer: Waste away Which of these could be stopped by a sheet of paper? A.) Alpha particle. B.) Beta particle. C.) Gamma ray. D.) Cosmic ray. Correct answer: Alpha particle Which of these is NOT an organic compound? A.) CH4 (methane). B.) C6H12O6 (glucose). C.) CH3COOH (acetic acid). D.) HCl (hydrochloric acid). Correct answer: HCl (hydrochloric acid). Which of these is the correct sequence of chambers through which blood flows in the human heart and lungs? A.) Right ventricle; right atrium; lungs; left atrium; left ventricle. B.) Right atrium; right ventricle; lungs; left atrium; left ventricle. C.) Left ventricle; left atrium; lungs; right atrium; right ventricle. D.) Left atrium; left ventricle; lungs; right atrium; right ventricle. Correct answer: Right atrium; right ventricle; lungs; left atrium; left ventricle. Which of these processes is used to free contaminated water of bacteria? A.) Filtering. B.) Passing it through charcoal. C.) Treating it with chlorine. D.) Allowing it to settle. Correct answer: Treating it with chlorine Which of these structures contains valves to prevent blood from flowing in the wrong direction? A.) Veins. B.) Arteries. C.) Capillaries. D.) Lymph ducts. Correct answer: Veins Which of these structures of the male reproductive system carries sperm cells from the testes to the lower part of the abdomen? A.) Urethra. B.) Seminiferous tubules. C.) Epididymis. D.) Vas deferens. Correct Vas deferens. A method for determining the blood alcohol content of a subject is to A.) do a Mantoux test. B.) do a Dick test. C.) use a Breathalyzer. D.) inspect the size of the pupils. Correct answer: use a Breathalyzer Guard cells which can be found in the leaves of plants are most closely associated with which of these processes? Correct Evaporation of water from the plant Human testes produce Correct answer: spermatozoa If the medulla of the brain in a human was damaged, which of these conditions would most likely result? A.) Inability to remember. B.) Difficulty in breathing. C.) Inability to speak. D.) Blurred vision. Correct answer: Difficulty in breathing In diagnostic testing, the electroencephalogram permits the physician to A.) examine the impulses of the specialized muscle cells of the heart. B.) examine the impulses of the nerve cells within the brain. C.) measure the pressure within the eye. D.) measure the amount of air upon exhalation. Correct answer: examine the impulses of the nerve cells within the brain In ecological succession, the first living thing to colonize a hitherto barren area is called a A.) producer. B.) primary consumer. C.) pioneer organism. D.) carnivore. Correct answer: pioneer organism To sterilize a metal probe in the office, a dentist could use a steam sterilizer. If unavailable, the next most effective method to sterilize the instrument would be Correct boiling it in water for 15 minutes. Iodized salt is used to prevent a human condition known as Correct answer: goiter The organ that filters metabolic waste from the blood is the A.) small intestine. B.) liver. C.) kidney. D.) stomach. Correct answer: kidney Unicellular organisms that have a nucleus and can swim with the aid of cilia are examples of Correct answer: protozoans Which of these conditions is associated with smoking? Correct answer: emphysema Which of these organisms use nitrogen directly from the air? Correct answer: Blue-green algae Which of these pairs of units measures the same quantity? Correct answer: Calorie and joule Which of these processes is responsible for the recorded production of CO2 by yeast cells from sugar solution? Correct answer: Anaerobic respiration Which of these substances contains a nonpolar covalent bond? A.) NaCl B.) HBr C.) O2 D.) NH3 Correct answer: O2 Which of these processes occurs at a neuromuscular junction? Correct answer: Impulse transmission. Which of these processes is illustrated by the spreading out of ammonia vapor in a closed room? Correct answer: Diffusion. When a drop of dilute nitric acid is added to water surrounding a hydra, the animal draws in its tentacles. The acid is acting as A.) a hormone. B.) an impulse. C.) a stimulus. D.) a response. Correct answer: a stimulus The physics principle that is primarily used in developing a rollercoaster ride is A.) centripetal force. B.) specific gravity. C.) (no) quantum energy. D.) (no) certainty principle. Correct answer: centripetal force. Sugar molecules enter a cell against a concentration gradient by the process of A.) passive diffusion. B.) facilitated diffusion. C.) osmosis. D.) active transport. Correct answer: active transport The light sensitive cells of the eye are called rods and cones. Which of these layers of the eye are they found in? A.) Cornea. B.) Retina. C.) Sclera. D.) Choroid. Correct answer: retina Substance Y is soluble only in nonpolar solvents and does not conduct electricity, either in the solid or liquid phases. Y is most probably A.) an ionic substance. B.) a polar substance. C.) a nonpolar substance. D.) a metallic substance. Correct answer: a nonpolar substance. Reducing the use of aeresol cans has contributed to the decrease of A.) the green house effect. B.) the destruction of the ozone layer C.) thermal pollution. D.) acid rain. Correct answer: the destruction of the ozone layer If the night temperature drops 50 degrees, the roadrunner's internal energy-conservation permits a lowering of body temperature to A.) 101°F B.) 98°F C.) 94°F D.) 90°F Correct answer: 94°F Ductless glands in the human body secrete A.) enzymes. B.) mucus. C.) hormones. D.) metabolic wastes. Correct answer: hormones. All the glucose filtered from the blood in the glomerulus into the Bowman's capsule of the kidney nephron is returned to the tissue fluid while passing along the proximal tubule. This rapid return is effected by the process of Correct answer: active transport A material that settles out of a reaction is termed a(n) A.) precipitate B.) product C.) reactant D.) solid Correct answer: precipitate A tincture is a solution in which A.) alcohol is the solvent. B.) water is the solvent. C.) alcohol is the solute. D.) water is the solute. Correct answer: alcohol is the solvent 30 students in a class carefully measure the length and width of 20 peanut shells. They also count the number and note the size of the peanuts inside. This information is recorded on various graphs showing the numbers of nuts and the different sizes. The collected evidence of the peanuts gives the students an idea of the extent of A.) natural selection within a species. B.) variation within a species. C.) evolution within a species. D.) speciation from a species. Correct answer: variation within a species Within a living cell, the oxygen (O2) from a mixture of O2 and carbon dioxide (CO2) is used up. This creates a concentration gradient across the cell membrane, drawing O2 across the membrane from the outside in, a process known as A.) Osmosis. B.) Active transport. C.) Diffuision. D.) Cellur respiration. Correct answer: Diffusion While working in the chemistry laboratory, a student spills dilute hydrochloric acid on her hand. What is the first action this student should take? Correct answer: Flush her hand with large quantities of water A person who was in an auto accident has formed a blood clot at the site of the injury. One event that can lead to formation of a blood clot is that A.) red blood cells release hemoglobin. B.) bone marrow cells decrease platelet production. C.) white blood cells release antibodies. D.) ruptured platelets release thromboplastin. Correct answer: ruptured platelets release thromboplastin Which part of the cell structure controls the passage of materials into and out of the cell? A.) Golgi apparatus. B.) Ribosome. C.) Nuclear membrane. D.) Plasma membrane. Correct answer: Plasma membrane 1 kilogram (kg) of solid X at 10°C and 1 kg of solid Y at 10°C each absorb 5 joules of heat energy. The final temperatures of X and Y are 15°C and 20°C, respectively. Compared to X, Y must have a lower A.) specific heat. B.) conductive heat. C.) heat of fusion. D.) heat of vaporization. Correct answer: specific heat A drop of dilute ammonium hydroxide (NH4OH) is placed on one side of a slide containing a large number of swimming paramecium. Under this condition, which of these behaviors of the paramecia will be observed? A.) They will eventually all swim toward the ammonium hydroxide. B.) They will show no net change in behavior to the ammonium hydroxide. C.) They will all be instantly killed by the ammonium hydroxide. D.) They will eventually all swim away from the ammonium hydroxide. Correct answer: They will eventually all swim away from the ammonium hydroxide. A woman suddenly chokes on a piece of food and clutches frantically at her throat. A.) An immediate remedy is to have her bend forward and tell her to cough. B.) insert a finger or a blunt object toward the back of the mouth. C.) apply quick, hard pressures successively to her abdomen, just beneath her diaphragm. D.) phone "emergency" for help Correct answer: apply quick, hard pressures successively to her abdomen, just beneath her diaphragm. In varieties of matter, the term heterogeneous may be applied to A.) elements, but not compounds. B.) compounds, but not elements. C.) compounds and elements, but not mixtures. D.) mixtures, but not elements or compounds. Correct answer: mixtures, but not elements or compounds. The bending of a wave around an obstacle is known as A.) diffraction. B.) deflection. C.) refraction. D.) reflection. Correct answer: diffraction The process of nuclear cell division in the cell reproduction of plants differs from mammals. A major difference is that A.) homologous chromosomes are paired. B.) centrioles are replicated. C.) spindle fibers are missing. D.) cell plates are synthesized. Correct answer: homologous chromosomes are paired Which of these particles can only be found in the nucleus of an atom? A.) protons, only. B.) electrons, only. C.) protons and neutrons. D.) neutrons and electrons. Correct answer: protons and neutrons. According to the Ideal Gas Equation (PV = nRT), if the temperature and amount of gas are kept constant, what will be the effect of an increase in pressure on the volume of a gas? A.) As the pressure increases, the volume decreases. B.) As the pressure increases, the volume increases. C.) The volume equalizes despite pressure changes. D.) The volume and pressure are unrelated Correct answer: As the pressure increases, the volume decreases. As an object falls freely near the surface of the earth, its speed increases, representing a transformation of A.) friction to kinetic energy. B.) kinetic energy to friction. C.) kinetic energy to potential energy. D.) potential energy to kinetic energy. Correct answer: potential energy to kinetic energy. At room temperature, which of these substances exists as diatomic molecules? A.) Carbon. B.) Iron. C.) Neon. D.) Oxygen. Correct answer: Oxygen Coulomb's law is most closely associated with A.) gravitational fields. B.) fluid flow. C.) electric charges. D.) nuclear forces. Correct answer: electric charges. During exercise, a person's respiratory rate increases due to A.) an increase in CO2 concentration in the blood. B.) a decrease in O2 concentration in the lungs. C.) an increase in hemoglobin in the blood. D.) a decrease in CO2 concentration in the blood. Correct answer: an increase in CO2 concentration in the blood. If a person is fasting for 24 hours and ingests no carbohydrates, the liver will provide for the body's need by A.) converting glycogen into glucose. B.) breaking down red blood cells. C.) emulsifying fat. D.) producing more bile. Correct answer: converting glycogen into glucose. If all of the second-order consumers within an ecosystem of a region were removed, the most likely short-term effect would be A.) a decrease in decomposers. B.) an increase in producers. C.) an increase in the number of first-order consumers. D.) a decrease in the number of first-order consumers. Correct answer: an increase in the number of first-order consumers. In order to observe the endoplasmic reticulum in a cell, a scientist would use A.) a light-microscope. B.) an electron microscope. C.) an ultracentrifuge. D.) dissecting instruments. Correct answer: an electron microscope. Muscles are attached to bone by which of these structures? A.) Cartilage. B.) Ligament. C.) Capsula. D.) Tendon. Correct answer: Tendon. Sodium will react most readily with A.) potassium. B.) helium. C.) chlorine. D.) boron. Correct answer: chlorine The amplitude of a sound wave is most closely related to its A.) pitch. B.) speed. C.) wavelength. D.) loudness. Correct answer: loudness The full set of genes in an individual is known as A.) specific DNA. B.) the human genome. C.) a chromosomal pattern. D.) cellular identity. Correct answer: the human genome. The physics principle that is primarily used in developing a rollercoaster ride is A.) centripetal force. B.) specific gravity. C.) quantum energy. D.) certainty principle. Correct answer: centripetal force. The surface of the moon has almost no atmosphere and is one-sixth the gravitational acceleration of the earth. If a feather and a hammer were dropped near the surface of the moon A.) the feather would hit the surface first because it has less mass. B.) the hammer would hit the surface first because it has more mass. C.) the feather and the hammer would hit the surface at the same time. D.) it is impossible to predict which would hit the surface first without more information. Correct answer: the feather and the hammer would hit the surface at the same time. The vertical columns on the periodic chart are known as A.) periods. B.) ions. C.) metalloids. D.) groups. Correct answer: groups The horizontal columns on the periodic chart are known as A.) periods. B.) ions. C.) metalloids. D.) groups. Correct answer: periods What is the pH of a solution whose H+ ion concentration is 1 x 10-2 mole per liter? A.) 1 B.) 2 C.) 12 D.) 13 Correct answer: 2 When a drop of dilute nitric acid is added to water surrounding a hydra, the animal draws in its tentacles. The acid is acting as A.) a hormone. B.) an impulse. C.) a stimulus. D.) a response. Correct answer: a stimulus When two atoms share a pair of electrons, the bond between them is called A.) electrovalent. B.) covalent. C.) ionic. D.) metallic. Correct answer: covalent Which aspect of a simple machine is represented by the ratio work output to work input? A.) Power expended. B.) Efficiency. C.) Ideal mechanical advantage. D.) Actual mechanical advantage. Correct answer: Efficiency Which of these arrangements of atoms is found in all alcohols? A.) C=C B.) C-O-C C.) C=O D.) C-OH Correct answer: C-OH Which of these changes occurs in the kidneys when a person becomes dehydrated? A.) The kidneys filter more water and there is less reabsorption of water from the blood. B.) The filtration rate of water remains constant and the reabsorption of water increases. C.) The filtration rate of water increases and the reabsorption of water remains constant. D.) No changes occur in kidney function. Correct answer: The filtration rate of water remains constant and the reabsorption of water increases. Which of these pH values represents the most basic solution? A.) 2 B.) 4 C.) 12 D.) 14 Correct answer: 14 which of the following would be classified as a vertebrate A.) earthworm B.) starfish C.) snake D.) lobster Correct answer: snake the human diaphragm can be described as A.) the muscle that protects the entrance tot he larynx B.) the location in the lungs where the diffusion of respiratory gasses occurs C.) the muscular sheet that assists in the mechanics of breathing D.) the tube down which air passes on its way to the lungs Correct answer: a muscular sheet that assists in the mechanics of breathing which of these conditions most likely explains the sudden death of many fish in a river on a hot day in summer? A.) an increased number of predators B.) an increased growth of algae C.) a reduced food supply D.) a reduced amount of dissolved oxygen Correct answer: a reduced amount of dissolved oxygen the energy associated with an object's motion is called A.) potential energy B.) nuclear energy C.) kinetic energy D.) thermal energy Correct answer: kinetic energy the frequency of a sound wave is directly related to its A.) loudness B.) pitch C.) timbre D.) resonance Correct answer: pitch Which measurement shows the normal pulse and blood pressure values for a patient? A.) 55/min, 125/95 mm/hg B.) 72/min, 120/80 mm/hg C.) 60/min, 100/75 mm/hg D.) 80/min, 72/120 mm/hg Correct answer: 72/min, 120/80 mm/hg When the rib cage moves upward and outward and the diaphragm flattens out A.) air is expelled from lungs B.) air is drawn into lungs C.) air pressure in the lungs rises D.) there is no change in the air pressure in the lungs Correct answer: air is drawn into lungs The term that describes how the stem of a plant grows toward the light is A.) -phototropism B.) -geotropism C.) +phototropism D.) +geotropism Correct answer: +phototropism The electrical activity of the brain is recorded as an A.) electrocardiogram B.) angiogram C.) electroencephalogram D.) electromotor response Correct answer: electroencephalogram the first living thing found colonizing a hitherto barren area is called a A.) producer B.) primary consumer C.) pioneer organism D.) carnivore Correct answer: pioneer organism Photographs in an old family album reveal that an area now covered with shrugs and small trees and occasionally gets swampy in the spring was once a pond, this is an example of A.) food chain B.) ecological succession C.) an ecosystem D.) the colonization of barren land Correct answer: ecological succession If attempts to decompose a substance prove unsuccessful, the substance is probably A.) an element B.) a compound C.) a mixture D.) a liquid Correct answer: an element A solution with hydrogen ion concentration of 1x10-7 is A.) acidic B.) basic C.) neutral D.) alkaline Correct answer: neutral An animal who's retina has no cone cells probably can not A.) see at all B.) distinguish color C.) see 3D objects D.) distinguish shades of black and white Correct answer: distinguish color the average kinetic energy of a substance increases when A.) its temp increase B.) its temp decreases C.) it changes from liquid to solid D.) it changes from liquid to gas Correct answer: its temp increases within which of these structures of the female reproductive tract is the human egg fertilized A.) uterus B.) fallopian tube C.) vagina D.) ovary Correct answer: fallopian tube The xylem vessels of a plant carry A.) food down from the leaves B.) carbon dioxide into the leaves C.) chlorophyll to assist in photosynthesis D.) water up from the roots Correct answer: water up from the roots A small foil disk was attached to a leaf of a plant that was placed in a well lit area, after 2 hours the leaf was removed from the plant and chlorophyll was extracted from it. how would the leaf appear after it was stained with lug's solution (iodine) A.) uniformly black B.) white C.) mostly black except for a white area corresponding to the presence of the disk D.) mostly white except for a black area corresponding to the presence of the disk Correct answer: mostly black except for a white area corresponding to the presence of the disk When a human RBC is placed in distilled water it will A.) swell up and eventually burst B.) shrink in size C.) stay the same size D.) actively pump water out of the cell Correct answer: swell up and eventually burst The enzymes found in the stomach and small intestine that hydrolyze fats are called A.) amylases B.) peptidases C.) proteases D.) lipases Correct answer: lipases Blood returning to the heart from the body travels through the vena cave and enters the A.) RA B.) RV C.) LA C.) LV Correct answer: RA a particle of light energy is called a A.) positron B.) neutron C.) betatron D.) photon Correct answer: photon A simple series circuit carries a current of 3.0 amp when the potential difference across it is 24.0 volts, the resistance of this circut is A.) 0.125 omega B.) 8.0 omega C.) 27.0 omega D.) 72.0 omega Correct answer: 8.0 omega Tissue that is striated with multinucleate cells is found at A.) the heart B.) the stomach C.) the brain D.) the arm muscle Correct answer: the arm muscle In which of these media will monochromatic light have the lowest speed, refractive indices given A.) lucite 1.50 B.) diamond 2.42 C.) water 1.33 D.) air 1.00 Correct answer: diamond 2.42 Although it is not possible to experiment with human beings to obtain genetic info, data on human genetics have been obtained from A.) observing human eggs under a microscope B.) listing the genetic characteristics of individual humans C.) fertilizing human eggs in a glass dish D.) making family trees that include information about certain diseases that related individuals have had Correct answer: making family trees that include information about certain diseases that related individuals have had The region of the human brain where speech function and conscious thought processes are located is called the A.) cerebrum B.) cerebellum C.) medulla oblongata D.) hypothalamus Correct answer: cerebrum a structure associated with osmosis in the amoeba and paramecium is the A.) nucleus B.) mitochondria C.) contractile vacuole D.) ribosome Correct answer: contractile vacuole What is the correct voltage of a chemical cell that has reached equilibrium A.) 1v B.) greater than 1v C.) between 0 and 1v D.) 0v Correct answer: 0v A cross between a plant with red flowers and one bearing white flowers produces pink flowers, this is an example of A.) incomplete dominance B.) mendel's law of independent assortment C.) mendel's law of segregation D.) sex linkage Correct answer: incomplete dominance a chemical change always involves the formation of a A.) compound B.) gas C.) new element D.) new substance Correct answer: new element If a solution turns litmus blue, it will also turn phenolphthalein A.) pink B.) green C.) yellow D.) colorless Correct answer: pink The interaction of bone and muscle that results in a specific musculoskeletal movement can best be characterized by the physical principle of a A.) pulley B.) spring C.) wave D.) lever Correct answer: lever One possible reason that animals such as mice, moles, and rabbits have such rapid rates of reproduction is that they A.) are herbivorous B.) live together in burrows C.) are predators D.) serve as prey for many other animals Correct answer: serve as prey for many other animals Solid objects become positively charged by A.) losing protons B.) gaining protons C.) losing electrons D.) gaining electrons Correct answer: losing electrons Which of these statements accurately describes what happens to an object as it falls freely near the surface of the earth A.) its kinetic an potential energies decrease B.) its kinetic energy decreases and its potential energy increases C.) its kinetic energy increases and its potential energy decreases D.) its kinetic and potential energies increase Correct answer: its kinetic energy increases and its potential energy decreases Which process produces the energy in modern nuclear reactors A.) fusion B.) alpha decay C.) fission D.) electron capture Correct answer: fission Which molecule contains nonpolar covalent bonds A.) NaCl B.) Cl2 C.) Her D.) CO2 Correct answer: Cl2 The scientific name of the cat is Felis domestics, the term Felis indicates which of these levels of classification A.) genus B.) species C.) family D.) kingdom Correct answer: genus Different types of white blood cells are classified histologically, they are distinguished from one another base on their morphology and their A.) cell size B.) number in a sample of blood C.) staining characteristics D.) ability to engulf bacteria Correct answer: ability to engulf bacteria Which of the following is an example of a physical property? a substance's ability to A.) react with an acid B.) oxidize a compound C.) decomose D.) dissolve in water Correct answer: dissolve in water Coulomb's law is most closely associated with Correct answer: electric charges.