21. During the light-dependent reactions of photosynthesis, which of the following does not occur?

A. Splitting of water
B. Carbon dioxide fixation
C. Release of oxygen
D. Absorption of light energy by photosystems

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22. Which of the following structures or processes are logically associated with chloroplasts?

A. Plant cells
B. Chlorophyll
C. Thylakoid membranes
D. All of these

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23. In oxygenic photosynthesis, water is split in order to provide the

A. electrons needed to reduce P680
B. O₂ needed for the dark reactions
C. electrons needed to reduce NADH
D. electrons needed for cyclic photophosphorylation

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24. Where do the protons come from that make up the proton gradient used in the light reactions of photosynthesis?

A. Glucose
B. ATP
C. H₂O
D. NADPH

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25. Oxidative phosphorylation is to respiration as __________ is to photosynthesis

A. carbon fixation
B. electron transport chain
C. light capture by chlorophyll
D. reduction of NADPH

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