Question at position 11 If something binds to the active site of an enzyme and blocks the substrate from binding, that is an example ofnoncompetitive inhibitioncooperativitycompetitive inhibition

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Consider the mechanism described: an inhibitor binds at the active site and prevents the substrate from binding. This is the textbook definition of competitive inhibition, where the inhibitor competes with the substrate for the same active site on the enzyme.

Option 1: noncompetitive inhibition. This type involves the inhibitor binding to a site other than the active site (an allosteric site) and changing enzyme activity without directly blocking substrate binding at the active site. Because the description specifies blocking substrate binding at the active site, this option does not fit.

Option 2: cooperativity. Cooperativity refers to interactions between multiple subunits of an enzyme (often hemoglobin) where binding at one site affects binding at others. It is not about direct competition for the active site by an inhibitor, so this is not applicable to the scenario described.

Option 3: competitive inhibition. In competitive inhibition, an inhibitor that resembles the substrate binds to the active site, preventing the actual substrate from binding. This precisely matches the scenario described in the question, making this the correct conceptual fit.

Question at position 11 If something binds to the active site of an enzyme and blocks the substrate from binding, that is an example ofnoncompetitive inhibitioncooperativitycompetitive inhibition

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