High Levels of Citric Acid Inhibit the Enzyme Phosphofructokinase, a Key

question 10

Multiple Choice

High levels of citric acid inhibit the enzyme phosphofructokinase, a key enzyme in glycolysis. Citric acid binds to the enzyme at a different location from the active site. This is an example of

• A) competitive inhibition.
• B) allosteric regulation.
• C) the specificity of enzymes for their substrates.
• D) an enzyme requiring a cofactor.
• E) positive feedback regulation.

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