Question

Identify the INCORRECT statement with respect to enzymatic activity.

• A. Increase in the substrate concentration increases the velocity of enzyme activity.
• B. Km value is a constant and a characteristic feature of a given enzyme.
• C. The activity of enzymes is increased at low temperature.
• D. The rate of reaction is increased with the increasing concentration of the enzyme.

Hint:

Enzymes become inactive at low temperature, and activity is highest at the optimum temperature.

Answer 1

The Correct Option is C

Step 1: Understanding the Concept
Enzyme activity depends on substrate concentration, enzyme concentration and temperature.

Step 2: Check the statements
Raising the substrate concentration raises the velocity until all sites are filled: true.
Km is constant for an enzyme and substrate: true.
More enzyme gives a higher rate when substrate is in excess: true.

Step 3: Find the incorrect one
At low temperature enzymes become inactive, though they are not destroyed.
Activity is highest at the optimum temperature and not at low temperature.

Final Answer:
The incorrect statement is that enzyme activity increases at low temperature. \[ \boxed{\text{(C) }\text{The activity of enzymes is increased at low temperature.}} \]