ATI TEAS Test Science Questions & Answers Solved 100%

An organism with chloroplasts in its cells is probably. a. a heterotroph b. an autotroph c. an herbivore d. a primary consumer - Answer B: Organisms that have chloroplasts in their cells carry on photosynthesis and are therefore autotrophs. Autotrophs make their own food. What property of water allows someone to fill a glass slightly above the rim without the water flowing over? a. specific gravity b. capillarity c. opacity d. surface tension - Answer D: Water molecules are polar. Due to the fact that O2 draws the electrons in the molecule toward itself. The spaces between neurons are called? a. synapses b. dendrites c. inter-neurons d. cell gaps - Answer A: An impulse travels down the axon of a neuron and reaches the terminus. There, chemicals are released in response, which travel across the synapse to the next neuron. Thus the impulse is transmitted to the next neuron. Which Group of chemicals is not normally found in most living things? a. carbohydrates b. proteins c. silicates d. nucleic acids - Answer C: Carbohydrates, proteins, and nucleic acids (RNA and DNA) are all very important chemicals in living things. The alimentary canal is associated with the? a. spinal cord b. digestive system c. urinary tract d. birth canal - Answer B: The alimentary canal begins at the mouth and ends at the anus. The numerous villi in the small intestine serve to? a. secrete enzymes for digestion b. absorb water from dissolved foods c. secrete hydrochloric acid to dissolve food d. provide greater surface for absorption - Answer D: The villi are tiny projections in the small intestine that increase the total surface area of the intestine for absorption of digested nutrients. As light passes obliquely from air to water, it is bent. This bending is called? a. diffraction b. reflection c. refraction d. dispersion - Answer C: Refraction is the bending of light as it passes obliquely from one medium to another. Which of the following organelles is not involved in protein synthesis? a. ribsome b. mitochondrion c. rough endoplasmic reticulum d. nucleus - Answer D: The nucleus contains DNA. The ribosomes, located on the rough endoplasmic reticulum, are the site for protein synthesis. To be absorbed by cells, proteins must be changed to? a. amino acids b. sucrose c. fatty acids d. glycerol - Answer A: Amino acids are the end products of protein digestion and are small enough to be absorbed. A neuron that transmits impulses from the receptors to the spinal cord is called? a. motor neuron b. an associative neuron c. an interneuron d. a sensory neuron - Answer D: A sensory neuron conveys a message from a sensory organ to the spinal cord, which transmits the message via a motor neuron to the effector muscle. Which group of organisms help prevent the accumulation of organic wastes in nature? a. rabbits b. mosses c. bacteria d. ferns - Answer C: Bacteria comprise the decomposer portion of the food chain. As the eardrum is made to vibrate more rapidly, the sound is perceived as? a. louder in intensity b. softer in intensity c. higher in pitch d. lower in pitch - Answer C: High-pitch sounds are heard when the receptor cells closer to the oval window are stimulated, and low-pitch sounds result from the stimulation of the cells that are farther down the cochlea. In a field of pure white asters, a grower noticed a single blue aster. How could the grower test whether this change affected the gamete-producing cells of the plant? a. self-pollinate the flower, and plant the resulting seeds b. examine the blue petals under an electron microscope c. preform a chemical analysis to find the nature of the blue pigment d. preform vegetative propagation on a cutting of the plant - Answer A: Remember that during a phase change from liquid to gas the temperature remains constant at 100C. A human egg will develop into a female if it is fertilized by sperm containing? a. an X chromosome b. a Y chromosome c. an XY chromosome d. an XXY chromosome - Answer A: A female has two X chromosomes, and a male has one X chromosome and one Y chromosome. For a human egg to develop into a female, it must be fertilized by a sperm containing an X chromosome. In a food chain involving grass, grasshoppers, birds and mammals, the orginal source of energy is? a. glucose b. sunlight c. chlorophyll d. ATP - Answer B: Sunlight is absorbed by the chlorophyll contained in plants. The absorbed energy fuels photosynthesis which produces glucose. In this food chain, grass is the producer. Which of the following equations represents a neutralization reaction? a. 2Na+MgCl2 > Mg+2NaCl b. CaCO3+4C > 3CO+CaC2 c. 4NH3+5O2 > 6H2O+4NO d. H2CO3+Ca(OH)2 > 2H2O+CaCO3 - Answer D: Equation d is a reaction between an acid (carbonic acid) and a base [(Ca(OH)2] to form water and a salt. It is the only neutralization reaction among the choices. A reading on the Celsius scale is 5. On the Fahrenheit scale, the reading would be closet to? a. 225 b. 30 c. 40 d. 95 - Answer C: the formula for converting temperature in Celsius to temperature in Fahrenheit is: T Fahrenheit = 9/5 x T Celsius + 32, therefore 5 degrees Celsius convert to 41 degrees Fahrenheit. 9/5 x 5 = 9 9 + 31 = 41F Which of these formulas represents an alcohol? a. C2H5OC2H5 b. C3H8 c. CH3COOH d. C2H5OH - Answer D: An alcohol is usually characterized structurally by the presence of an OH group attached to a hydrocarbon. If a car's rate of change of velocity is negative, the car is? a. speeding up b. maintaining a constant speed c. slowing down d. stopped - Answer C: If a car's rate of change of velocity is negative, the car's acceleration is negative. this means that the car is decelerating (slowing down). Consider the unbalanced equation __N2+__H2 > __NH3. What is the coefficient of ammonia in the balanced equation that has the smallest whole-number coefficient? a. 1 b. 2 c. 3 d. 4 - Answer B: When balancing an equation, the number of atoms of each element must be the same on both sides of the equation: N2+3H2 > 2NH3 Which of these nitrogenous bases may be found in RNA, but not DNA? a. uracil b. adenine c. thymine d. guanine - Answer A: Uracil is found in RNA but not DNA. Thymine is found in DNA but not in RNA. Guanine, cytosine and adenine are found in both. A substance with a ph of 8 is a? a. strong acid b. weak acid c. strong base d. weak base - Answer D: A substance with a ph between 8 and 14 is basic. The closer the substance gets to a ph of 14, the more basic it is. Binary fission in paramecia and budding in yeast cells are examples of? a. asexual reproduction only b. sexual reproduction only c. spontaneous generation and sexual reproduction d. both sexual and asexual reproduction - Answer A: Binary fission and budding are both examples of asexual reproduction, because cell division in both cases depends on mitosis. Which of these substances forms an alkaline solution in water? a. Mg(OH)2 b. H2SO4 c. MgSO4 d. NaCl - Answer A: Magnesium hydroxide is the only base of the four choices. Thus in water, magnesium hydroxide releases hydroxide ions, forming a basic or alkaline solution. Certain seaweeds accumulate iodine in a concentration as much as a million times greater than that of the surrounding ocean. How must this intake be accomplished? a. osmosis b. diffusion c. active transport d. passive transport - Answer C: Since the concentrations are so much greater in seaweed than in the surrounding water, iodine must have to move against a concentration gradient. Hydrogen can be prepared in the laboratory by combining Zn and HCl. In the resulting reaction, the metallic zinc (Zn). a. is changed to another element b. reacts with the water in the acid c. replaces the combined hydrogen in the acid d. serves as a catalyst - Answer C: In the reaction, zinc replaces hydrogen and produces zinc chloride. Thus, hydrogen gas is released. Zn+2HCl > ZnCl2+H2 This is a single replacement reaction. Which of the following organisms has a nutritive process most similar to that of animals? a. seaweed b. oak tree c. grass d. bread mold - Answer D: Bread mold is a fungus. Fungi are unable to make their own food and are dependent on other life forms for nutrition. Fungi are heterotrophs. The other choices are all autotrophs. The solubility of a solid in a liquid generally increases with? a. an increase in temperature b. an increase in pressure c. a decrease in temperature d. a decrease in pressure - Answer A: Solubility of a solid in a liquid increases with increasing temperature but is unaffected by pressure. Pressure will only affect the solubility of a gas. Which of these substances has the highest boiling point? a. ether b. ethanol c. water. d. glycerol - Answer C: Water molecules are attracted to each other by hydrogen bonds. The others are not dipoles, so the attraction between the molecules is minimal. In humans, if the diaphragm is pushed upward there is a decrease in chest volume. this decrease is followed by? a. an increase in pressure in the chest cavity and inhalation b. an increase n pressure in the chest cavity and exhalation c. a decrees in pressure in the chest cavity and inhalation d. a decrease in pressure in the chest cavity and exhalation - Answer B: A decrease in volume results in an increase in pressure (Boyle's law) and thus exhalation. Which of these biological processes includes the other three? a. cell respiration b Krebs cycle c. electron transport chain d. anaerobic splitting of glucose - Answer A: Cellular respiration begins with the splitting of glucose. The products then enter the Kreb's cycle and then the electron transport chain. A 5-year-old and her father each lifted identical chairs from the floor to the table top. Which person did the most work? a. the father b. the 5-year-old c. they both did the same amount d. not enough information is given - Answer C: Work done is independent of who is doing it. Since both people move the object over the same distance and use the same force, they do the same amount of work. An excess of which of these ions tends to make a solution acidic? a. chloride b. hydroxyl c. hydronium d. sodium - Answer C: Hydronium ions, or H3O+, are essentially hydrogen ions combined with a nearby water molecule. In essence, acids are characterized by the presence of hydrogen or hydronium ions. In the classification of two organisms, which of the following is the best evidence of a close relationship? a. similar number and arrangement of bones b. similar sequence of amino acids in their proteins c. similar methods of sexual reproduction d. similar methods of cell respiration - Answer B: A similarity in amino acids suggests a similarity in the structure of the DNA and thus a close relationship between the organisms. In Einstein's equation, E=mc2, which does C represent? a. the quantum numbers of the atoms involved b. the number of coulombs c. the number of calories of heat d. the speed of light - Answer D: Einstein's equation, E=MC2, means energy = mass x (speed of light)2 the vaporization of solid dry ice to gaseous carbon dioxide by heating is an example of? a. sublimation b. evaporation c. precipitation d. condensation - Answer A: Sublimation is the direct vaporization of a solid by heating, without passing through a liquid state. On top of a mountain, the boiling point of water is? a. lower then at sea level, because the atmospheric pressure is higher on the mountain b. lower then at sea level, because the atmospheric pressure is lower on the mountain c. the same as at sea level, because the atmospheric pressure is the same in both locations d. higher then at sea level, because the atmospheric pressure is lower on the mountains - Answer B: The boiling point of a solution is the temperature at which the vapor pressure is equal to the pressure of the atmosphere. Suppose cube A is 10cm along each edge and cube B is 5 cm along each edge. What is the relationship of the volume of cube A to that of Cube B? a. cube A has two times the volume of cube B b. cube A has four times the volume of cube B c. cube A has six times the volume of cube B d. cube A has eight time the volume of cube B - Answer D: Cube A has a volume of 1,000 cm3, whereas cube B has a volume of 125 cm3. Cube A has 8 times the volume of cube B. Which of these substances is a product of cellular respiration in animals? a. ATP b. RNA c. ethanol d. oxygen - Answer A: Cellular respiration is an energy-yielding process that releases ATP (adenosine triphosphate) from organic molecules.