What effect does a noncompetitive inhibitor have on an enzyme's structure and function?

• A. It binds to an allosteric site, altering the enzyme's shape and reducing its activity.
• B. It increases the enzyme's affinity for the substrate.
• C. It competes with the substrate for the active site, decreasing the reaction rate.
• D. It binds to the substrate, preventing enzyme interaction.

Answer: (A)