Exam2Key - Copy - BCOR 11 Exploring Biology Exam # 2 Name _...

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BCOR 11 Exploring Biology Exam # 2 Name ________________________ Section ___________ For this Multiple Choice Exam you should record your choice of the best answer for each question on the SCANTRON sheet. You must use a number 2 pencil for recording to insure proper machine reading of your choices. Remember to print your name on the Scantron and Exam paper. 1) Which of the following statements correctly describe(s) catabolic pathways? A) They do not depend on enzymes. B) They consume energy to build up polymers from monomers. C) They release energy as they degrade polymers to monomers. D) They lead to a net increase in free energy. E) Both A and B 2) Which of the following statements is not representative of the second law of thermodynamics? A) Conversion of energy from one form to another is always accompanied by some loss of free energy. B) Heat represents a form of energy that cannot be used by most organisms to do work. C) Without an input of energy, organisms would tend towards increasing entropy. D) Cells require a constant input of energy to maintain their high level of organization. E) Every energy transformation by a cell decreases the entropy of the universe. 3) Which of the following forms of energy is least available to accomplish cellular work? A) light energy B) chemical energy C) thermal energy (heat) D) mechanical energy E) potential energy 4) What is the change in free energy of a system at chemical equilibrium? A) slightly increasing B) greatly increasing C) slightly decreasing D) greatly decreasing E) no net change 5) In general, the most important way ATP energizes a cellular process is by A) releasing heat upon hydrolysis. B) acting as a catalyst. C) coupling free energy released by ATP hydrolysis to free energy needed by other reactions. D) lowering the activation energy of a chemical reaction. E) binding directly to the substrate(s) of the enzyme.
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6) When 10,000 molecules of ATP are hydrolyzed to ADP and P i in a test tube, about twice as much heat is liberated as when a cell hydrolyzes the same amount of ATP. Which of the following is the best explanation for this observation? A) Cells are open systems, but a test tube is a closed system. B) Cells are less efficient at heat production than nonliving systems. C) The hydrolysis of ATP in a cell produces different chemical products than does the reaction in a test tube. D) The reaction in cells must be catalyzed by enzymes, but the reaction in a test tube does not need enzymes. E) Cells convert some of the energy of ATP hydrolysis into other forms of energy besides heat. 7) Which of the following statements regarding ATP is (are) correct? A) ATP serves as a main energy shuttle inside cells. B) ATP drives endergonic reactions in the cell by the enzymatic transfer of the phosphate group to
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This note was uploaded on 05/22/2011 for the course BIO 6 taught by Professor Lalala during the Spring '11 term at East Los Angeles College.

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Exam2Key - Copy - BCOR 11 Exploring Biology Exam # 2 Name _...

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