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1

In cellular respiration, energy-depleted electrons are donated to an inorganic molecule. In fermentation, what molecule accepts these electrons?
A)oxygen
B)an organic molecule
C)sulfur
D)an inorganic molecule other than O2
2

Which of the following is not a stage of aerobic respiration?
A)glycolysis
B)pyruvate oxidation
C)the Krebs cycle
D)electron transport chain
3

Which steps in glycolysis require the input of energy?
A)the glucose priming steps
B)the phosphorylation of glucose
C)the phosphorylation of fructose 6-phosphate
D)All of these steps require the input of energy.
4

Pyruvate dehydrogenase is a multienzyme complex that catalyzes a series of reactions. Which of the following is not carried out by pyruvate dehydrogenase?
A)a decarboxylation reaction
B)the production of ATP
C)producing an acetyl group from pyruvate
D)combining the acetyl group with a cofactor
5

How many molecules of CO2 are produced for each molecule of glucose that passes through glycolysis and the Krebs cycle?
A)2
B)3
C)6
D)7
6

The electrons generated from the Krebs cycle are transferred to ____________ and then are shuttled to _______________.
A)NAD+ / oxygen
B)NAD+ / electron transport chain
C)NADH / oxygen
D)NADH / electron transport chain
7

The electron transport chain pumps protons
A)out of the mitochondrial matrix.
B)out of the intermembrane space and into the matrix.
C)out of the mitochondrion and into the cytoplasm.
D)out of the cytoplasm and into the mitochondrion.
8

What process of cellular respiration generates the most ATP?
A)glycolysis
B)oxidation of pyruvate
C)Krebs cycle
D)chemiosmosis
9

Oxidizing which of the following substances yields the most energy?
A)proteins
B)glucose
C)fatty acids
D)water
10

The final electron acceptor in lactic acid fermentation is:
A)pyruvate
B)NAD+
C)lactic acid
D)O2







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