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Exam 2 Spring 09

Exam 2 Spring 09 - ANSWERKEY 1. false A. B....

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ANSWER KEY  1. Which of the following statements regarding events in the functioning of photosystem II is  false A. Light energy excites electrons in an antenna pigment in a photosynthetic unit.  B. The excitation is passed along to a molecule of P680 chlorophyll in the      photosynthetic unit.  C.    The P680 chlorophyll donates a pair of protons to NADPH, which is thus converted  to NADP+.   D.  The electron vacancies in P680 are filled by electrons derived from water. E.  The splitting of water yields molecular oxygen as a by-product. 2.  Which of the following types of reactions would decrease the entropy within a cell?  3.  DNA content in ng/cell was measured in several cells from an ovary.  During mitosis, cells go  from what number to what number?  A) I to II to I to III  B) I to II to I  C) II to I  D) III to I  E) always remain at I  4.  Dinitrophenol (DNP) was once used as a weight control agent.  We now know that DNP  forms holes in the inner mitochondrial membrane, and has a similar effect on the thylakoid  membrane.  Damage caused by DNP in plants will have the most direct effect on which of the  1
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following processes?  5.  What is the main role of the antenna pigment molecules in the thylakoid membranes?  6.   Succinate dehydrogenase catalyzes the conversion of succinate to fumarate. The reaction is  inhibited by malonic acid, which resembles succinate but cannot be acted upon by succinate  dehydrogenase. Increasing the ratio of succinate to malonic acid reduces the inhibitory effect of  malonic acid. Which of the following is correct?  A) Succinate dehydrogenase is the enzyme, and fumarate is the substrate.  B) Succinate dehydrogenase is the enzyme, and malonic acid is the substrate.  C) Succinate is the substrate, and malonic acid is the product.  D) Fumarate is the product, and malonic acid is a noncompetitive inhibitor.  E) None of the above are correct.
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