Question

Which enzymes of the light reactions are most likely to be inhibited by inhibitors of mitochondrial oxidative phosphorylation?

A- photosystem I and ferrodoxin
B- photosystem II and rubisco
C- photosystem II and photosystem I
D- cytochrome b6f and ATP synthase

Answer 1

Cytochrome b6f and ATP synthase in the photosynthetic electron transport chain are likely to be inhibited by inhibitors of mitochondrial oxidative phosphorylation. Option D is correct.

Step-by-step explanation:

The question is asking which enzymes involved in the light reactions of photosynthesis would likely be inhibited by inhibitors of mitochondrial oxidative phosphorylation. The answer is D- cytochrome b6f and ATP synthase. These two components are part of the photosynthetic electron transport chain (ETC) and share functional similarities with their mitochondrial counterparts involved in oxidative phosphorylation.

Inhibitors of the mitochondrial ETC such as rotenone, antimycin-A, and cyanide target similar types of components that are involved in electron transport and ATP production. Specifically, cytochrome b6f is analogous to the mitochondrial cytochrome b-c1 complex and ATP synthase is a common enzyme in both chloroplasts and mitochondria that generates ATP.