The function of enzymes in the living system is to

Options

A. Catalyse biochemical reactions
B. Provide energy
C. Transport oxygen
D. Provide immunity

Answer

**Step-by-Step Text Solution:**

1. **Definition of Enzymes**: Enzymes are proteins that act as biological catalysts in living organisms. They facilitate biochemical reactions without being consumed in the process.

2. **Role of Enzymes**: The primary function of enzymes is to accelerate chemical reactions in the body. They lower the activation energy required for reactions to occur, thus speeding up the rate of these reactions.

3. **Specificity of Enzymes**: Enzymes are highly specific, meaning each enzyme catalyzes a particular reaction or type of reaction. For example, the enzyme invertase specifically catalyzes the hydrolysis of sucrose into glucose and fructose.

4. **Examples of Enzymatic Reactions**:
- **Sucrose Hydrolysis**: The enzyme invertase catalyzes the reaction where sucrose (C12H22O11) reacts with water (H2O) to produce glucose (C6H12O6) and fructose (C6H12O6).
- **Maltose Hydrolysis**: The enzyme maltase catalyzes the conversion of maltose (C12H22O11) into two molecules of glucose (C6H12O6).

5. **Conclusion**: Therefore, the function of enzymes in living systems is to catalyze biochemical reactions, making option A the correct answer.

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