BIO Practice Test #1|45 Questions with Verified Answers,100% CORRECT

BIO Practice Test #1|45 Questions with Verified Answers Relationship between isoelectric point and ph? - CORRECT ANSWER The lower the pH the lower the isoelectric point What moves in the mobile phase? - CORRECT ANSWER The mobile phase is non polar. So non polar molecules move in the mobile phase ("like dissolves like" A cell has a -70 mV from the exterior to the interior, where is the potential the highest? In what direction do the electric field lines point? - CORRECT ANSWER Because the potential is higher on the OUTSIDE (because there is a -70 mV drop from out--> in the electric field lines point out--> in because (+-->-) Given power,work, frequency, and wavelength. If the overall energy doesn't change but the concentrates into shorter pulses what are we talking about? - CORRECT ANSWER POWER (change in energy/ time) . Because energy doesn't change we can't look at wavelength/frequency/work. Which of the following statement about RNA is untrue? a. RNAs can act as enzymes to catalyze reactions. b. Some RNAs have more than four different types of bases. c.Some RNAs are synthesized in the nucleolus. d.RNAs are insusceptible to alkaline hydrolysis. - CORRECT ANSWER D is untrue. Because of their 2'OH the RNA is more susceptible and less stable than DNA . In the hydrolysis of acid chloride what does water act like? - CORRECT ANSWER A nucleophile What is a urea group? (how many in caffeine? ) - CORRECT ANSWER a urea group is a carbonyl carbon bonded to two nitrogen. Caffeine has 1 . A converging glass lens forms a real image of a red object at a distance equal to twice its focal length. If a blue object is placed adjacent to the red object, will its image form closer to the lens or farther from the lens than the image of the red object? Answer: Closer, because blue light is refracted more due to its shorter wavelength Why?? - CORRECT ANSWER Blue light has a shorter wavelength than red light which means it has a larger frequency. The refractive index of a medium increases with increasing frequency thus the refractive index for blue light will be larger. Thus because it would bend more, it would bend closer. The lens is converging because diverging lenses cannot form real images. What is a meso compound? - CORRECT ANSWER One with 2 chiral centers and a plane of symmetry How do SN2 reactions work? - CORRECT ANSWER With a primary substrate and one step Do Northern Blots look at DNA or mRNA? - CORRECT ANSWER Northern blots look at mRNA and southern blots look at DNA . What differentiates totipotent and pluripotent cells? - CORRECT ANSWER Pluripotent cells can differentiate into any cells from ecto,endo,or mesoderm while the totipotent cells can do that and differentiate into a trophoblast (which is the outer layer of the blastocyst that provides nutrients to the embryo) What is the relationship between Young's modulus and stiffness? - CORRECT ANSWER The more stiff something is, the larger the Young's modulus . The concentration of ketone bodies in the blood is expected to be increased the most in: a. a person with untreated type 1 diabetes b. a runner who is eating extra carbohydrates for a few days before a race. c.a person with untreated epilepsy. individual who has started a low fat diet in an attempt to lose weight. - CORRECT ANSWER A. A person with untreated Type 1 diabetes. Ketogenesis occurs when the glucose levels are low and require fats to produce ketone bodies. Thus A is the right answer. What type of lenses correct for nearsightedness? (myopia?) - CORRECT ANSWER Concave and DIVERGING lens What is the type of bond between two sugar molecules? - CORRECT ANSWER (alpha)-glycosidic bond Of the following, which is the strongest oxidizing agent, based on Table 1? a.Ag(s) b.Zn2+(aq) c.Cu2+(aq) d.Ni(s) - CORRECT ANSWER Cu is the answer. Neutral metals tend to be oxidized (eliminating a and d) . The strongest OA is the one to be more easily reduced (which would have the most positive E value) What is a low retention time in Gas Chroma associated with? - CORRECT ANSWER A low BP/ volatile compound, while a high Rf in chromate is associated with a non polar compound. Under what conditions can the Hardy-Wienberg equation be used? - CORRECT ANSWER When trying to determine the frequency of autosomal recessive or dominant traits What is the function of the cerebellum ? - CORRECT ANSWER Helps maintain balance What occurs to Gastrin at a low pH (such as in the stomach ? ) - CORRECT ANSWER It is inhibitive. This is an example of negative feedback. What do Prokaryotes use to supercoil their DNA? What do Eukaryotes use? - CORRECT ANSWER Prokaryotes use DNA gyrase. Eukaryotes use histones/ topoisomerase. What is the recombination frequency? - CORRECT ANSWER #of recombinants/ total number of offsprings What is the unlinked phenotype of two parents with a double heterozygote genotype (Ex: TtCc) - CORRECT ANSWER 9:3:3:1 What type of Amino Acid is glutamine ? - CORRECT ANSWER hydrophillic and polar Can Tumors use cap independent translation? - CORRECT ANSWER yes tumors use it when growth conditions are less than ideal (which is often because they are constantly proliferating) Is G6Phosphotase or Fructose6Phosphotase used in the pentose phosphate pathway? - CORRECT ANSWER G6P How does fructose 2,6-Biphosphate work? - CORRECT ANSWER It exhibits reciprocal control on glycolysis and gluconeogenesis. It stimulates PFK-1 in glycolysis and inhibits fructose-1,6-bisphosphotase (gluconeogenesis) Eye color, skin color, and hair color in humans are examples of? - CORRECT ANSWER Polygenism- where the trait is determined by several genes with several alleles 2. Solve 3/4 + 1/3 = a. 4/7 b. 4/4 c. 4/3 d. 13/12 - CORRECT ANSWER d. 13/12 3. The arrow is pointing to the _______________________ . a. Aortic semilunar valve b. Mitral valve c. Pulmonary semilunar valve d. Tricuspid valve - CORRECT ANSWER b. Mitral valve 4. What role does DNA play in the S phase of the cell cycle? a. DNA condenses to become as small as possible for replication. b. DNA must uncoil and be copied. c. DNA remains unchanged.d. DNA is converted to RNA. - CORRECT ANSWER b. DNA must uncoil and be copied. 7. What does the pH scale measure? a. The strength of a base. b. The strength of an acid. c. The concentration of hydroxide ions. d. The concentration of hydrogen ions. - CORRECT ANSWER d. The concentration of hydrogen ions. 9. Solve 5²*3 + 40 = a. 55 b. 65 c. 70 d. 115 - CORRECT ANSWER d. 115 10. Solve and convert your answer into a mixed number: 3.5 + 0.25 -1.00 = a. 2 1/4 b. 2 1/2 c. 2 3/4 d. 3 - CORRECT ANSWER 11. Which system of the human body is responsible for ensuring that nutrients are delivered to all organs and tissues? a. Circulatory b. Respiratory c. Digestive d. Nervous - CORRECT ANSWER a. Circulatory 14. A controlled experiment can only test _____. a. one hypothesis at a time b. one theory at a time c. one variable at a time d. one control at a time - CORRECT ANSWER c. one variable at a time 15. The passageway that is used for food and for breathing is the: a. Esophagus b. Trachea c. Larynx d. Pharynx - CORRECT ANSWER d. Pharynx 16. Which of the following is NOT considered part of the central nervous system? a. The brain b. The spinal cord c. A nerve in the arm d. The frontal lobe - CORRECT ANSWER c. A nerve in the arm 17. Which of the following is the basis of the ocean's food chain? a. Fish b. Algea c. Phytoplankton d. Coral - CORRECT ANSWER c. Phytoplankton 18. Animals cells are many times the size of bacterial cells. Approximately how much larger are they? a. 10 times as large b. 100 times as large c. 1000 times as large d. 10,000 times as large - CORRECT ANSWER a. 10 times as large 19. Choose the correct way of writing the following sentence:Ilene stewart has lived in the same house on howard Street in Hobart Wisconsin for 26 years a. Ilene Stewart has lived in the same house on Howard Street in Hobart Wisconsin for 26 years? b. Ilene Stewart has lived in the same house on howard Street in Hobart, Wisconsin for 26 years. c. Ilene stewart has lived in the same house on Howard Street in Hobart, Wisconsin, for 26 years! d. Ilene Stewart has lived in the same house, on Howard Street, in Hobart, Wisconsin, for 26 years. - CORRECT ANSWER d. Ilene Stewart has lived in the same house, on Howard Street, in Hobart, Wisconsin, for 26 years. 24. Choose the answer that corrects the error with a comma, semicolon, dash or colon. The weather I believe is hot in Florida. a. The weather - I believe - is hot in Florida. b. The weather; I believe, is hot in Florida. c. The weather I believe: is hot in Florida. d. The weather, I believe, is hot in Florida. - CORRECT ANSWER d. The weather, I believe, is hot in Florida. 25.Describe the correlation between height and hair length. a. positive b. negative c. no correlation d. cannot be determined - CORRECT ANSWER c. no correlation 29. Find the area of the shaded region. a. 99 cm² b. 81 cm² c. 97 cm² d. 101 cm² - CORRECT ANSWER c. 97 cm²