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BIO 101 BIO 101 Past Questions Objective Question
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Question

How do Photosystem I and Photosystem II differ in function during the light reactions?
Options
A PSII splits water and initiates electron flow; PSI transfers electrons to NADP+
Correct Answer
B PSI splits water, PSII generates ATP directly
C PSI is involved in photolysis, PSII fixes carbon
D PSII is inactive in non-cyclic photophosphorylation
Correct Answer

Option A is the correct answer.

Detailed Explanation

Photosystem II (P680) catalyzes the photolysis of water, providing electrons and protons. Photosystem I (P700) ultimately provides electrons to reduce NADP+ to NADPH.

Hint

The numbering relates to their order of discovery, but functionally, PSII comes first in the chain.

Question Info

Course: BIO 101
Topic: BIO 101 Past Questions
Type: Objective
Difficulty: Not specified
Question 690 of 2556
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