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How the Krebs Cycle Works

View the animation below, then complete the quiz to test your knowledge of the concept.






1Before entering the Krebs cycle, pyruvate is converted to
A)glucose.
B)H2O and CO2.
C)acetic acid.
D)acetyl-CoA.
E)oxaloacetate.



2A single "turn" of the Krebs cycle will yield
A)1 ATP, 2 NADH, and 1 FADH2.
B)1 ATP, 2 NADH, and 2 FADH2.
C)1 ATP, 3 NADH, and 1 FADH2.
D)2 ATP, 2 NADH, and 2 FADH2.
E)2 ATP, 3 NADH, and 2 FADH2.



3The initial reaction of the Krebs cycle involves the addition of a
A)2-carbon molecule to a 4-carbon molecule.
B)2-carbon molecule to a 5-carbon molecule.
C)2-carbon molecule to a 6-carbon molecule.
D)3-carbon molecule to a 4-carbon molecule.
E)3-carbon molecule to a 5-carbon molecule.



4The Krebs cycle occurs in the mitochondrion.
A)True
B)False



5A single "turn" of the Krebs cycle involves four different decarboxylation reactions.
A)True
B)False







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