16. In cells having organelles, the steps of the Krebs cycle and the electron transport system occur in the

A. cell membrane
B. mitochondria
C. endoplasmic reticulum
D. none of these

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17. As a result of the photosynthetic process, which product is formed?

A. Oxygen
B. Water
C. Carbon dioxide
D. Both (a) and (b)

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18. A eukaryotic cell that can carry out only fermentation instead of the complete aerobic respiration of glucose

A. produces less CO₂
B. is lacking in O₂
C. has mitochondria present
D. all of these

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19. What is the maximum absorption wavelength for photosystem I in green plants?

A. 550 nm
B. 600 nm
C. 700 nm
D. 750 nm

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20. Carbon dioxide is reduced in

A. noncyclic photophosphorylation
B. the Calvin cycle
C. the light reactions
D. both light and dark reactions

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