First slide

The Electron Transport

Question

Which of the following electron transport is exclusively downhill?

Moderate

A

P₆₈₀ → Pheophytin
B

P₇₀₀ → NADP⁺
C

Pheophytin → P₇₀₀
D

P₇₀₀ → PS II

Solution

Electrons from pheophytin move to plastoquinone then to Cyt b₆/f and finally to P₇₀₀ via plastocyanin.
During this journey, electrons continuously loose energy. Therefore, electron transport from pheophytin to P₇₀₀ is exclusively downhill.

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