Question

Which inactivates an enzyme by occupying its active site?

• A. Allosteric inhibitor
• B. Non- competitive inhibitor
• C. Competitive inhibitor
• D. All of the above

Answer 1

The correct option is C Competitive inhibitor

$\text{Factors affecting enzyme activity}$

The efficiency with which an enzyme can function depends on many factors, like- temperature, pH, substrate concentration, presence of inhibitors.

$\text{Inhibitors}$

Inhibitors are chemicals that stop enzyme activity. Based on their mode of action, there are the following types of inhibitors:-

• Competitive inhibitors
• Non-competitive inhibitors
• Allosteric inhibitors
• Irreversible inhibitors

$\text{Competitive inhibitors}$

Competitive inhibitors are chemicals whose structure resembles the substrate (S) and thus, competes with the substrate for the active site in the enzyme.

For example, the competitive inhibitor for methanol is ethanol on the enzyme alcohol dehydrogenase.


$\text{Final answer: Competitive inhibitor}$