Chapter 12 - Energy and Respiration

What does not occur in the conversion of glucose to two molecules of pyruvate?

• hydrolysis of ATP

• phosphorylation of ATP

• phosphorylation of triose (3C) sugar

• reduction of NAD

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Where does each stage of aerobic respiration occur in a eukaryotic cell?

• A

• B

• C

• D

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The diagram summarises how glucose can be used to produce ATP, without the use of oxygen. Which compounds are represented by the letters X, Y and Z?

• A

• B

• C

• D

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Which of the following statements is true regarding glycolysis?

• Glycolysis takes place in the mitochondria of a cell.

• Glycolysis produces a net of 1 ATP, 1 NADH, and 2 pyruvate

• Glycolysis can occur without the presence of oxygen.

• Glycolysis is the final step in aerobic respiration.

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In what part of the cell does glycolysis take place?

• nucleus

• cytoplasm

• mitochondria

• ribosomes

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ATP is an important biological molecule that transports chemical energy within cells and powers many biochemical reactions. Which of the following correctly describes the structure of ATP and how it provides energy?

• ATP contains a 5-carbon sugar, three phosphate groups, and an adenine base. Energy is released when the bond between the adenine base and the sugar is broken.

• ATP contains a 6-carbon sugar, two phosphate groups, and an adenine base. Energy is released when a single phosphate group is added to the existing two phosphate groups.

• ATP contains a 6-carbon sugar, three phosphate groups, and an adenine base. Energy is released when bonds within the 6-carbon molecule are broken.

• ATP contains a 5-carbon sugar, three phosphate groups, and an adenine base. Energy is released when the bond between the second phosphate group and third phosphate group is broken.

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Which of the following molecules is a reactant for cellular respiration?

• water

• carbon dioxide

• oxygen

• ATP

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What is the net production of ATP, pyruvate, and NADH when one molecule of glucose undergoes glycolysis?

• 4 ATP, 1 NADH, 2 pyruvate

• 2 ATP, 2 NADH, and 2 pyruvate

• 4 ATP, 2 NADH, and 4 pyruvate

• 2 ATP, 1 NADH, and 1 pyruvate

Which of the following combinations of molecules is the reactants of Krebs cycle?

• Acetyl-CoA & carbon dioxide

• NAD & carbon dioxide

• NAD & reduced FAD

• Acetyl-CoA & FAD

Which of the following occur during the Krebs cycle?

• Acetyl-CoA combines with oxaloacetate to form citrate.

• Reduced FAD accepts electrons to form FAD

• NAD is reduced to NADH

• Pyruvate is converted to acetyl-CoA