SAT Subject Biology Practice Question 17: Answer and Explanation

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Question: 17

3. Which of these produces a three-carbon sugar from carbon dioxide?

A. Photosystem I
B. Photosystem II
C. Electron transport chain
D. Calvin cycle
E. Citric acid cycle

Correct Answer: D


The Calvin cycle fixes carbon dioxide, converting it, via a series of reactions, to a three-carbon sugar.

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