A chemical substance which can react (in place of substrate) with the enzyme but is not transformed into product/s and thus blocks the active site temporarily or permanently is called_______________?
Correct answer: C. Inhibitor
- A. Co-enzyme
- B. Blocker
- C. Inhibitor
- D. Cofactor
Explanation
An inhibitor is a substance that reduces enzyme activity by binding to the enzyme; a competitive inhibitor can occupy the active site and prevent the substrate from binding. Cofactors and coenzymes assist enzyme activity rather than blocking it. Students may choose blocker because it describes the effect informally, but inhibitor is the accepted biological term for a substance that suppresses enzyme action.
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About Enzyme Inhibitors
Enzyme inhibitors reduce reaction rate by interfering with enzyme-substrate interaction or catalytic activity. Coverage includes reversible competitive, non-competitive and uncompetitive inhibition, the effects of inhibitor concentration on reaction rate, and why competitive inhibition can be reduced by increasing substrate concentration.
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