SAT Subject Biology Practice Question 264: Answer and Explanation

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Question: 264

14. In cellular respiration, the role of FADH2and NADH is to

A. catalyze the breakdown of glucose to three-carbon sugars
B. carry electrons to the cytochrome membrane proteins
C. catalyze the addition of a phosphate group to ADP
D. act as final electron acceptors in the electron transport chain
E. transport hydrogen ions across the inner mitochondrial membrane

Correct Answer: B

Explanation:

FADH2 and NADH are formed by reduction of FAD and NAD+ in the Krebs cycle. These reduced compounds carry electrons to the cytochrome proteins of the mitochondrial membrane.

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