The function of the enzymes in various chemical reactions:

Act as biological catalysts

The correct answer is Option (4) → Act as biological catalysts

Enzymes are biological catalysts. Their primary function in chemical reactions is to:

• Increase the rate of reaction (by lowering the activation energy).
• Not get consumed in the reaction.
• Remain unchanged at the end of the reaction.
• Be highly specific to their substrate.

Why the other options are incorrect:

1. Increase activation energy → Wrong. Enzymes decrease activation energy.
2. Biochemical enhancers → Not a standard or accurate term in this context.
3. Decreases the rate of reaction → Completely wrong. Enzymes increase the rate.