Photosynthesis

AP Biology· difficulty 3/5

Cytochrome b6f's role in the light reactions is to:

A
$Pump protons into the thylakoid lumen, building the proton gradient that drives ATP synthase$
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B
$Split water and release O2$
C
$Reduce NADP+ to NADPH$
D
$Fix carbon into G3P$

Explanation

As electrons pass through cyt b6f, the energy released pumps H+ from stroma into the thylakoid lumen, generating the proton motive force used by ATP synthase.

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