Biology (Mader), 10th Edition

Chapter 8: Cellular Respiration

How the Krebs Cycle Works

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



1.

Before entering the Krebs cycle, pyruvate is converted to
A)glucose.
B)H2O and CO2.
C)acetic acid.
D)acetyl-CoA.
E)oxaloacetate.
2.

A 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.
3.

The 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.
4.

The Krebs cycle occurs in the mitochondrion.
A)True
B)False
5.

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