Exam II Sample (1710)

Exam II Sample (1710) - Principles of Biology Exam II,...

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Principles of Biology Exam II, Sample Questions 1. A molecule loses electrons as a result of a chemical reaction. This molecule has been: a. metabolized. b. oxidized. c. reduced. d. endergonicly modified. e. exergonicly modified. 2. Proteins which act as catalysts of chemical reactions [in cells] are called: a. enzymes. b. coenzymes. c. reaction cofactors. d. substrates. e. reactants. 3. The pigment molecule found at the reaction center of photosystem II is: a. chlorophyll a. b. chlorophyll b. c. a carotenoids. d. either chlorophyll a or chlorophyll b, but never a carotenoids. e. either chlorophyll a, chlorophyll b, or a carotenoids. 4. The DG for a reaction is negative. This reaction is said to be: a. exergonic. b. coupled. c. anabolic. d. endergonic. e. unfavored 5. A final product of a metabolic pathway inhibits an early enzyme in the pathway. This is likely to be an example of: a. competitive inhibition. b. feedback inhibition. c. cooperativity. d. energy coupling. e. a second messenger. 6. The strategy of using ATP hydrolysis to drive another reaction which is thermodynamically unfavored is called: a. photosynthesis. b. chemiosmosis. c. energy coupling. d. protonmotive drive. e. catalysis. 7. Protein catalyzed reactions move forward more readily than uncatalyzed reactions because: a. the DG has been increased. b. the DG has been decreased. c. entropy has been increased. d. the required activation energy has been decreased.
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entropy has been decreased. _______________________________________________________________________ Using the energy profile for the reaction above, match the following: 8. Activation energy 9. DG 10. Free energy of reactants 11. Free energy of products 12. The reaction depicted above has a DG which is: a. positive. b. negative. c. Since it is enzyme catalyzed, DG is near zero. _______________________________________________________________________ 13. The second law of thermodynamics states that for chemical reactions: a. entropy always increases. b. entropy always decreases. c. free energy always increases. d. free energy always decreases. e. anabolic reactions must always be paired with catabolic reactions. 14. An example of a cellular junction which is involved in cell to cell communication is a/an: a. gap junction. b.
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This note was uploaded on 04/25/2008 for the course BIOL 1710 taught by Professor Jag during the Fall '08 term at North Texas.

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Exam II Sample (1710) - Principles of Biology Exam II,...

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