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

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

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

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

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

20. Carbon dioxide is reduced in

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