Biology (Raven), 10th Edition

Chapter 7: How Cells Harvest Energy

Pre-Test

1
Why does NAD+ serve as important electron carrier?
A)It is readily reduced and oxidized.
B)It is insoluble and is stationary within the cell.
C)It can accept electrons in a variety of positions along its length.
D)It "protects" electrons from winding up in fatty acid precursors where the energy would be wasted.
E)All of the above are correct.
2
What products result from the complete oxidation of glucose?
A)CO2
B)ATP
C)NADH
D)FADH2
E)All of these result from glucose oxidation.
3
Why must NAD+ be present during glycolysis?
A)It creates pyruvate directly from glucose.
B)A glycolysis intermediate must be oxidized in order to receive a phosphate so that substrate-level phosphorylation may occur.
C)It powers the electron transport chain.
D)It is a coenzyme which allows the 6 carbons of glucose to separate from each other, leading to two three-carbon products.
E)This is a trick question: NAD+ is only involved in the Krebs cycle.
4
What is/are the product(s) of pyruvate oxidation?
A)O2
B)Acetyl-CoA
C)NAD+
D)ATP
E)All of the above are created during pyruvate oxidation
5
How many CO2 molecules are released specifically from the Krebs cycle for each glucose molecule consumed?
A)1
B)2
C)3
D)4
E)6
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