Phosphofructokinase Is an Allosteric Enzyme That Catalyzes the Conversion of Fructose

question 57

Multiple Choice

Phosphofructokinase is an allosteric enzyme that catalyzes the conversion of fructose 6-phosphate to fructose 1,6-bisphosphate, an early step of glycolysis. In the presence of oxygen, an increase in the amount of ATP in a cell would be expected to ________.

• A) inhibit the enzyme and thus slow the rates of glycolysis and the citric acid cycle.
• B) activate the enzyme and thus slow the rates of glycolysis and the citric acid cycle.
• C) inhibit the enzyme and thus increase the rates of glycolysis and the citric acid cycle.
• D) activate the enzyme and thus increase the rates of glycolysis and the citric acid cycle.
• E) inhibit the enzyme and thus increase the rate of glycolysis and the concentration of citrate.

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