Many photosynthetic prokaryotes are capable of cyclic electron transport only. It is likely that such organisms can _____ but not _____. A)produce ATP; reduce H₂O B)produce ATP; reduce CO₂ C)produce NADPH; reduce CO₂ D)produce NADPH; oxidize H₂O E)reduce CO₂; synthesize carbohydrates

Question

Quizplus · Accepted Answer

Cyclic electron transport only generates ATP but not NADPH, therefore the organism cannot reduce CO₂ or carry out CO2 fixation to synthesize carbohydrates. Option A is incorrect because the organisms can produce ATP but cannot reduce H₂O in cyclic electron transport. Option C is incorrect because the organisms cannot produce NADPH in cyclic electron transport. Option D is incorrect because the organisms cannot oxidize H₂O in cyclic electron transport. Option E is incorrect because the organisms cannot synthesize carbohydrates directly with cyclic electron transport.

Many Photosynthetic Prokaryotes Are Capable of Cyclic Electron Transport Only