Question

Activation energy is required for

• A. Exothermal reactions
• B. Endothermal reactions
• C. Enzyme mediated reactions
• D. Starting all biochemical reactions

Answer 1

The correct option is D

Starting all biochemical reactions

The correct option is option (D):

Explanation of the correct option :

1. Activation energy is defined as the minimum energy required by a reacting molecule to be converted into a product.
2. The amount of activation energy is inversely proportional to the rate of reaction.
3. Activation energy is required to start a reaction.

Explanation of the incorrect option:

Option (A):

An exothermic reaction is a chemical reaction in which energy is released in the form of heat or light.

Option B:

Endothermic reactions are chemical reactions that make chemicals by absorbing heat from the environment.

Option (C):
In enzyme-mediated reaction enzymes speed up chemical reactions by acting as biological catalysts (biocatalysts).

Final answer: Activation energy is required to start a biochemical reaction.