AP biology chapter 7 cellular respiration and fermentation

Which is a correct description of the events of cellular respiration and the sequence of events in cellular respiration?

• oxidation of glucose to pyruvate; reduction of pyruvate; citric acid cycle; oxidative phosphorylation

• oxidation of glucose to pyruvate; oxidation of pyruvate; oxidation of acetyl-coA; oxidative phosphorylation

• glycolysis; reduction of pyruvate; citric acid cycle; oxidative phosphorylation

• glycolysis; oxidative phosphorylation; citric acid cycle; oxidation of pyruvate.

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Cellular respiration produces about 32 ATP from one glucose molecule. What happens to the rest of the energy in glucose?

• It is converted to starch.

• It is released as carbon dioxide and water.

• It is stored as fat.

• It is converted to heat.

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In glycolysis, there is no production of carbon dioxide as a product of the pathway. Which is the best explanation for this?

• The products of glycolysis contain the same total number of carbon atoms as in the starting material.

• The initial steps of glycolysis require an input of energy in the form of ATP (two per glucose).

• Glucose contains more carbons than the number of carbons found in the pyruvate products that are produced by glycolysis.

• There is very little ATP produced in glycolysis.

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Most of the NADH that delivers electrons to the electron transport chain comes from which process?

• substrate-level phosphorylation

• the citric acid cycle

• anabolic pathways

• oxidative phosphorylation

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In preparing pyruvate to enter the citric acid cycle, which step occurs?

• Pyruvate is reduced and decarboxylated, and the resulting electrons oxidize an NAD+ to an NADH

• Pyruvate is oxidized and decarboxylated, and the resulting electrons are donated to NADH to produce NAD+.

• Pyruvate is oxidized and decarboxylated, and the removed electrons are used to reduce an NAD+ to an NADH.

• Pyruvate is reduced to acetyl-coA, which involves the reduction of pyruvate, the addition of a carbon dioxide from the environment, and its reduction by NADH.

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Where do the reactions of the citric acid cycle occur in eukaryotic cells?

• the matrix of the mitochondrion

• across the inner membrane of the mitochondrion

• the cristae of the mitochondrion

• the cytosol

How many molecules of ATP are gained by substrate-level phosphorylation from the complete breakdown of a single molecule of glucose in the presence of oxygen?

• four

• about 16 ATP

• three

• two

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Which represent the major (but not the only) energy accomplishment of the citric acid cycle?

• completion of substrate-level phosphorylation

• formation of NADH and FADH2

• utilization of O2

• formation of CO2

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Which part of the catabolism of glucose by cellular respiration requires molecular oxygen (O2) and produces CO2?

• the electron transport chain

• the combination of the citric acid cycle and electron transport

• the combination of glycolysis and the citric acid cycle

• the citric acid cycle

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During aerobic respiration, molecular oxygen (O2) is used for which of the following purposes?

• between glycolysis and the citric acid cycle to split a carbon from pyruvate, producing CO2

• at the end of the electron transport chain to accept electrons and form H2O

• at the end of glycolysis to oxidize pyruvate

• at the end of the citric acid cycle to regenerate citric acid

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