Biology, Eighth Edition (Raven)

Chapter 7: How Cells Harvest Energy

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
Glencoe Online Learning CenterScience HomeProduct InfoSite MapContact Us

The McGraw-Hill CompaniesGlencoe

Please read our Terms of Use and Privacy Notice before you explore our Web site. To report a technical problem with this Web site, please contact the Web Producer.