BioMCQquestions

BioMCQquestions - P hotosynthesis 1. What are the products...

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Photosynthesis 1. What are the products of the light reactions that are subsequently used by the Calvin cycle? ? water and carbon ? carbon dioxide and RuBP? ? electrons and photons ? oxygen and carbon dioxide :-) ATP and NADPH 2. The chemiosmotic process in chloroplasts involves the ? reduction of carbon dioxide to glucose by NADPH and ATP ? diffusion of electrons through the thylakoid membrane. :-) establishment of a proton gradient. ? movement of water by osmosis into the thylakoid space from the stroma. ? oxidation of water to produce ATP energy. 3. Which of the following statements regarding events in the functioning of photosystem II is false? ? Light energy excites electrons in an antenna pigment in a photosynthetic unit. :-) The P680 chlorophyll donates a pair of protons to NADPH, which is thus converted to NADP + X The splitting of water yields molecular oxygen as a by-product. ? The electron vacancies in P680 are filled by electrons derived from water. X The excitation is passed along to a molecule of P680 chlorophyll in the photosynthetic unit. 4. Which of the following are products of the Calvin cycle and are utilized in the light reactions of photosynthesis? :-) ADP, Pi and NADP +
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? electrons and H + ? Water and oxygen ? both C and D are correct ? Carbon dioxide and glucose 5. Carbon dioxide fixation occurs during :-) Photosynthesis ? Respiration ? Neither A or B ? Both A and B 6. All of the events listed below occur in the energy-capturing light reaction of photosynthesis EXCEPT ? oxygen is produced. ? NADP + is reduced to NADPH :-) carbon dioxide is incorporated into PGA ? ADP is phosphorylated to yield ATP X light is absorbed and funneled to a reaction center chlorophyll "a" 7. On which of the following features do most plant and animal cells differ? X mitochondrial function X active transport mechanisms ? transcription :-) primary energy source ? structure of nucleus
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8. Photorespiration lowers the efficiency of photosynthesis by removing which of the following from the Calvin cycle? X RuBP carboxylase molecules ? ATP molecules ? glyceraldehyde phosphate molecules X carbon dioxide molecules :-) ribulose bisphosphate molecules 9. The process of noncyclic photophosphorylation uses light energy to synthesize X ADP and NADP ? ATP and P700 ? ADP and ATP ? P700 and P680 :-) ATP and NADPH 10. Use the following key: A. light reaction alone B. the Calvin cycle alone C. both A and B D. neither A or B E. occurs in the chloroplast but is not part of photosynthesis Which requires CO2? ? E ? C :-) B ? D ? A
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11. Use the following key: A. light reaction alone B. the Calvin cycle alone C. both A and B D. neither A or B E. occurs in the chloroplast but is not part of photosynthesis 12. Which produces NADPH? ? B
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BioMCQquestions - P hotosynthesis 1. What are the products...

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