In the Presence of Effector a an Enzyme Displays Sigmoidal

question 61

Multiple Choice

In the presence of effector A an enzyme displays sigmoidal behavior when initial velocity is plotted against substrate concentration. With increasing concentrations of A the curve is displaced to the left (i.e., towards the ordinate) . Effector A is thus

• A) a positive allosteric effector.
• B) a competitive inhibitor.
• C) a negative allosteric effector.
• D) a non-competitive inhibitor.
• E) an uncompetitive inhibitor.

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