DAT Biology Practice 2023/2024 Exam with 100% Verified Questions and Answers
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DAT
DAT Biology Practice 2023/2024 Exam
with 100% Verified Questions and
Answers
Which of the following does not occur during telophase?
A. Reassembly of the nuclear envelope
B. Reappearance of the nucleoli
C. Uncoiling of the chromosomes
D. Centromere division
E. Dismantling of the spindles -...
DAT Biology Practice 2023/2024 Exam with 100% Verified Questions and Answers Which of the following does not occur during telophase? A. Reassembly of the nuclear envelope B. Reappearance of the nucleoli C. Uncoiling of the chromosomes D. Centromere division E. Dismantling of the spindles - CORRECT ANSWER D. Centromere Division Explanat ion: Centromere division occurs during anaphase of mitosis and during anaphase II of meiosis Enzymes which catalyze the phosphorylation of organic molecules are called A. Lipases B. Kinases C. Mutases D. Amylases E. Esterases - CORRECT ANSWER B. Kinases Explanation: Lipases digest fats; Mutases remove erroneous nucleotides from DNA; Amylases break down starches into disaccharides; Esterases cleave ester bonds The primary transmitter of the parasympathetic nervous system is A. Norepinephrine B. Epinephr ine C. Acetylcholine D. Cholinesterase E. Amylase - CORRECT ANSWER C. Acetylcholine According to the first law of thermodynamics, A. Energy transfer leads to less organization B. A system that is isolated from any energy source increases in entropy C. Evolution is possible through the absorption of energy D. Energy is balanced by living things E. Total energy in an isolated system remains constant - CORRECT ANSWER E. Total energy in an isolated system remains constant Explanation: The first law o f thermodynamics states "in any process, the total energy of the universe remains constant," or in other words, energy can neither be created nor destroyed. This also applies to any isolated system, i.e., any system that does not exchange mass or energy wi th its surroundings The myeline sheath is NOT A. Produced by Schwann cells in the peripheral nervous system B. Found surrounding all vertebral axons C. Produced by the fusion of many lamellae of plasma membrane D. Mostly lipid in composition E. Used to increase the speed of an action potential - CORRECT ANSWER B. Found surrounding all vertebral axons Explanation: The myeline sheath only surrounds certain axons, but not all of them In the circulatory system, blood pressure gradually drops as blood flows from artery to capillary due to I. Friction between blood and blood vessel walls II. The increase in total cross -sectional area III. Arteriosclerosis (artery plaque accumulation) A. I only B. II only C. I and II D. II and III E. I, II, and III - CORRECT ANSWER C. I and II Explanation: The process of slowing down blood flow results in a decrease in blood pressure. The reduction in speed is caused in two ways. First, the small diameter of each of the capillaries is not much larger than the diameter of the red bloods cells that pass through them. This results in the friction described in statement I. Secondly, because arterioles branch into so many capillaries, the total cross se ctional area of the capillaries is much greater than that of the arterioles. The exchange of oxygen for carbon dioxide and water vapor at the alveolus occurs by A. Active transport B. Passive diffusion C. Pinocytosis D. Phagocytosis E. Facilitated di ffusion - CORRECT ANSWER B. Passive diffusion Explanation: Each of the compounds listed, oxygen, carbon dioxide, and water, are permeable to the cell membrane and do not require transport proteins. This eliminates A and E. Each compound travels down its r espective concentration gradients, and does so by passive diffusion Which of the following decreases during cellular cleavage? A. Nuclear -to-cytoplasmic -material ratio B. Surface -to-volume ratio of each cell C. Nutrient and gas exchange
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