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Photosynthesis and Respiration

Photosynthesis and Respiration
Carbon dioxide is reduced in

both light and dark reactions
noncyclic photophosphorylation
the light reactions
the Calvin cycle

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Photosynthesis and Respiration
The cytochrome c oxidase complex

donates four electrons to O2
pumps protons out of the matrix space
accepts electrons from cyt c
all of these

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Photosynthesis and Respiration
Where does the O2 come from that is essential for the proper functioning of oxidative phosphorylation?

Carbon fixation
Fermentation
Light reactions of photosynthesis
Dark reactions of photosynthesis

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Photosynthesis and Respiration
Assume the combined processes of photosynthesis and cellular respiration, the electrons that start as part of H2O at the beginning of the light reactions end up attaching to

pyruvate to make ethanol
O2 to make new H2O
NADPH to make new glucose
electron transport carriers to make O2

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Photosynthesis and Respiration
During the light-dependent reactions of photosynthesis, which of the following does not occur?

Carbon dioxide fixation
Absorption of light energy by photosystems
Release of oxygen
Splitting of water

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Photosynthesis and Respiration
What is the maximum absorption wavelength for photosystem I in green plants?

550 nm
700 nm
600 nm
750 nm

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