Multiple choice

Which of the following statements regarding enzyme inhibition is correct?

  1. Competitive inhibition is seen when a substrate competes with an enzyme for binding to an inhibitor protein.

  2. Competitive inhibitors often bind to the enzyme irreversibly.

  3. Competitive inhibition is seen when the substrate and the inhibitor compete for the active site on the enzymes.

  4. Non-competitive inhibition of an enzyme can be overcome by adding large amount of substrate.
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C Correct answer
Explanation

 Competitive inhibition is seen when the substrate and the inhibitor compete for the active site on the enzymes. Most competitive inhibitors function by binding reversibly to the active site of the enzyme. As a result, many sources state that this is the defining feature of competitive inhibitors.

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