During decarboxylation, NAD+ is formed from NADH.
Indicate whether this statement is true or false.
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Question 2) Pyruvate dehydrogenase is a multienzyme complex that brings together a molecule of pyruvate and a molecule of coenzyme A.
Indicate whether this statement is true or false.
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Question 3) Pyruvate dehydrogenase is located in the
A. cytosol.
B. cell membrane.
C. outer compartment of the mitochondrion.
D. middle of the crista.
E. matrix of the mitochondrion.
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Question 4) Which stage of cellular respiration is catalyzed by pyruvate dehydrogenase?
A. Electron transport system
B. Intermediate stage
C. Citric acid cycle
D. Glycolysis
E. Fermentation to lactate
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Question 5) During cellular respiration, decarboxylation occurs when
A. a carbon atom is removed from glucose.
B. a carbon dioxide molecule is removed from the cytosol.
C. a carboxyl group is released from pyruvate.
D. a carbon atom is removed from and an oxygen atom is added to fructose.
E. all carbon and oxygen atoms are released from a high-energy molecule.
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Question 6) During the early steps of glycolysis, glucose is converted to glucose 6-P, and then glucose 6-P is converted directly to
A. aldolase.
B. fructose 6-P.
C. isomerase.
D. pyruvate.
E. NADH.
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Question 7) The binding of ATP to phosphofructokinase inhibits the glycolytic pathway.
Indicate whether this statement is true or false.
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Question 8) Glycolysis results in the breakdown of a glucose molecule and the net production of four ATP molecules.
Indicate whether this statement is true or false.
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Question 9) If insufficient oxygen is available for the anaerobic breakdown of pyruvate, it is converted to _________.
Fill in the blank with correct word.
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Question 10) Hexokinase is an enzyme involved in cellular respiration and its substrate is glucose. Considering this information, hexokinase must be located
A. in the lumen of the stomach.
B. in the lumen of the small intestine.
C. inside the mitochondria of cells.
D. in the cytosol of cells.
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