Question

Given graph shows effect of substrate concentration on rate of reaction of enzyme phosphatase. What does it indicate?

• A. Rate is proportional to substrate concentration
• B. Presence of an enzyme inhibitor
• C. Formation of E - S complex
• D. At high substrate concentration pH changes.

Answer 1

The correct option is B Presence of an enzyme inhibitor

Enzyme inhibitor binds to an enzyme and decreases its activity. Here in the given graph, the rate of the reaction decreases because the substrate combines with the enzyme inhibitor that blocks the active site of the substrate. So, they are unable to form the enzyme-substrate complex and thus the rate of reaction decreases.

So, the correct answer is option B.