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21. For each pair of electrons passing from NADH located inside the mitochondria to oxygen, how many ATP molecules can be generated?

A. 1
B. 2
C. 3
D. 4

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22. In anaerobic respiration, the final electron acceptor can be

A. oxygen
B. nitrate
C. pyruvate
D. acetyl-CoA

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23. Which one of the following is not produced in any of the steps of glycolysis?

A. NAD⁺
B. NADH
C. ADP
D. ATP

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24. The number of ATP molecules produced from one glucose molecule by a bacterium producing lactic acid is

A. greater than producing ethanol
B. lesser than producing ethanol
C. approximately equal to producing ethanol
D. none of these

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25. Which of the following is the most complete definition of fermentation?

A. Oxidation of glucose with organic molecules serving as electron acceptors
B. Complete catabolism of glucose to CO₂ and HO₂
C. Production of energy by substrate-level phosphorylation
D. Production of ethyl alcohol from glucose

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