21. Which one of the following is not the intermediate of Kreb’s cycle?

A. Isocitrate
B. Succinate
C. Fumarate
D. Stearate

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22. Which one is not the main protein in the electron transport chain?

A. NADH dehydrogenase
B. Cytochrome bc1 complex
C. Cytochrome oxidase
D. Citrate synthase

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23. How many ATPs are produced during the citric acid cycle?

A. 10
B. 13
C. 12
D. 8

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24. The FADH₂ and NADH produced by the oxidation of one acetyl-CoA results in the synthesis of about

A. 3 ATPs
B. 6 ATPs
C. 11 ATPs
D. 15 ATPs

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25. In eukaryotes, electron transport occurs in

A. membranes and mitochondria
B. endoplasmic reticulum
C. cytoplasm
D. all of the above

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