AP Biologymediummcq1 pt
The two photosystems work in series so that
A.electrons gain enough energy to reduce NADP⁺
B.twice as much oxygen is released
C.CO₂ can be fixed at night
D.ATP production is avoided
Explanation
Core Concept
PSII's boost moves electrons along the chain, and PSI's second photon excitation lifts them high enough to reduce NADP⁺ — the Z-scheme's two-step ladder.
Correct Answer
Aelectrons gain enough energy to reduce NADP⁺
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