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

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This scenario describes allosteric regulation, where a molecule (in this case, citric acid) binds to a site on the enzyme away from its active site, altering the enzyme's shape and function. This is different from competitive inhibition, where a molecule competes with the substrate for binding to the enzyme's active site. The other choices are not relevant to this scenario.

High Levels of Citric Acid Inhibit the Enzyme Phosphofructokinase