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Which best describes consumption of glucose in the Krebs cycle?

A. The Krebs cycle consumes one molecule of glucose in each cycle.
B. The Krebs cycle runs four times for each molecule of glucose consumed.
C. The Krebs cycle runs twice for each molecule of glucose consumed.
D. The Krebs cycle consumes two molecules of glucose in each cycle.

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Final answer:

The Krebs cycle runs twice for each molecule of glucose consumed, producing energy carriers and releasing CO2.


Explanation:

The Krebs cycle runs twice for each molecule of glucose consumed. This is because the catabolism of one glucose molecule produces two pyruvates, which in turn produce two acetyl-CoA molecules in the oxidative decarboxylation of pyruvate under aerobic conditions. Each turn of the cycle stores energy in 3 NADH+H, one FADH, and one ATP, and releases 2 CO2.


Learn more about Krebs cycle glucose consumption here:

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