What are enzyme ? Describe their functions. Name two diseases which are caused due to deficiency of enzymes.

Explanation

### Step-by-Step Solution:

1. **Definition of Enzymes**:
Enzymes are biological catalysts that speed up chemical reactions in living organisms. They are primarily composed of globular proteins.

2. **Function of Enzymes**:
- Enzymes lower the activation energy required for a reaction to occur.
- By providing an alternative pathway for the reaction, they increase the rate at which the reaction occurs.
...