SAT Subject Biology Practice Question 19: Answer and Explanation

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Question: 19

5. All of the following take place in the thylakoid of the chloroplast EXCEPT

A. NADP+ is reduced to create NADPH
B. hydrogen ions are pumped against their concentration gradient
C. ATP is produced by the ATP synthase enzyme
D. excited electrons transfer energy to an electron transport chain
E. carbon dioxide molecules are converted to a three-carbon sugar

Correct Answer: E

Explanation:

Carbon dioxide is converted to a three-carbon sugar as part of the Calvin cycle, or dark reactions, which take place in the fluid stroma of the chloroplast. The remaining answer choices take place in the light reactions of photosynthesis, which take place in the thylakoids of the chloroplast.

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