Question

Assertion: Enzymes lower the activation energy.
Reason: A substrate molecule can be acted upon by a particular enzyme.

• A. Both A and R are true and R is the correct Explanation for A.
• B. Both A and R are true, but R is not the correct explanation for A.
• C. A is true and R is false.
• D. A is false and R is true.

Answer 1

The correct option is B

Both A and R are true, but R is not the correct explanation for A.

Option b:

Assertion statement:

1. Enzymes work by binding to reactant molecules and holding them in place so that chemical bond-breaking and bond-formation processes can occur more easily.
2. Enzymes reduce activation energy by lowering the energy required for reactants to come together and react.
3. This decrease in activation energy is required to convert a reactant into a product.

Reason statement:

1. An enzyme is substrate-specific and vice versa.
2. This property of an enzyme is known as enzyme specificity, and it is based on the lock and key theory model.
3. This is due to the active site's shape any other substrates cannot bind to it.

Final answer:

Both Assertion and Reason are true, but the reason is not the correct explanation for assertion.