SAT Subject Biology Practice Question 293: Answer and Explanation

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Question: 293

3. Which of the following substances are produced by the light reactions of photosynthesis?

A. ATP and NADPH
B. ATP and glucose
C. NADH and glucose
D. ATP and NADH
E. NADPH and glucose

Correct Answer: A

Explanation:

A The light reactions of photosynthesis convert solar energy to usable energy in the form of ATP (choices C and E are eliminated) and NADPH (a reduced electron carrier). The ATP and NADPH (i.e., energy) produced during these reactions are used later during the Calvin cycle to fix carbon dioxide into carbohydrates, like glucose. Because glucose is a product of the light-independent reactions, choice B could be eliminated. Remember that NADPH belongs with photosynthesis to eliminate choice D.

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