Question

Competitive inhibition is due to

• A. Protein poison
• B. Substrate analogue
• C. Nonavailability of activation energy
• D. Short wave radiation

Answer 1

The correct option is B Substrate analogue

Part of an enzyme where substrate molecules get attached is known as an active site. On attachment to the active site, the substrate is changed into the product. The active site has a residue which helps in the attachment of substrate. The substrate molecules form a temporary bond with the enzyme at the active site.

A molecule similar to substrate competes with the substrate for the active site. Such molecules are known as an inhibitor. The presence of the inhibitor decreases availability of the active site for the substrate and further decreases the rate of reaction. This inhibition is known as competitive inhibition.

So, the correct answer is option B.