Generation of proton gradients across membranes

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34) Generation of proton gradients across membranes occurs during A) photosynthesis. B) respiration. C) both photosynthesis and respiration. D) neither photosynthesis nor respiration. E) photorespiration. Answer: C Topic: Concept 10.2 Skill: Knowledge/Comprehension 35) What is the relationship between wavelength of light and the quantity of energy per photon?
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10 36) In a protein complex for the light reaction (a reaction center), energy is transferred from pigment molecule to pigment molecule, to a special chlorophyll a molecule, and eventually to the primary electron acceptor. Why does this occur? 37) P680 + is said to be the strongest biological oxidizing agent. Why? 38) Some photosynthetic bacteria (e.g., purple sulfur bacteria) have photosystem I but not II, while others (e.g. cyanobacteria) have both PSI and PSII. Which of the following might this observation imply? A) Photosystem II must have been selected against in some species. B) Photosystem I must be more ancestral. C) Photosystem II may have evolved to be more photoprotective. D) Cyclic flow must be more primitive than linear flow of electrons. E) Cyclic flow must be the most necessary of the two processes.
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11 Answer: B Topic: Concept 10.2 Skill: Synthesis/Evaluation
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