DAT Biology Practice Exam

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 - Answer- D. Centromere Division Explanation: 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 - 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. Epinephrine C. Acetylcholine D. Cholinesterase E. Amylase - 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 - Answer- E. Total energy in an isolated system remains constant Explanation: The first law of 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 with 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 fusio