Multiple Choice
Which product of the Krebs cycle is also used as a reactant in the Krebs cycle?
a) Citrate.
b) ATP.
c) Acetyl-CoA.
d) Oxaloacetate.
3. Energy & Cell Processes
Krebs Cycle
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In the citric acid cycle, for each pyruvate that enters the cycle, one ATP, three NADH, and one FADH2 are produced. For each glucose molecule that enters glycolysis, how many ATP, NADH, and FADH2 are produced in the citric acid cycle?
A
Four ATP, six NADH, two FADH2
B
Three ATP, three NADH, one FADH2
C
About 38 ATP
D
One ATP, three NADH, one FADH2
E
Two ATP, six NADH, two FADH2
Verified step by step guidance1
Understand that one glucose molecule is converted into two pyruvate molecules during glycolysis.
Recognize that each pyruvate molecule enters the citric acid cycle separately.
For each pyruvate, the citric acid cycle produces one ATP, three NADH, and one FADH2.
Since there are two pyruvate molecules from one glucose, multiply the products of one cycle by two: 2 ATP, 6 NADH, and 2 FADH2.
Conclude that for each glucose molecule, the citric acid cycle produces two ATP, six NADH, and two FADH2.
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