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

Explanation

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

**Step 1: Definition of Enzymes**
Enzymes are biological catalysts that speed up chemical reactions in living organisms. They are typically proteins that facilitate various biochemical processes by lowering the activation energy required for reactions to occur.

**Step 2: Functions of Enzymes**
Enzymes serve several critical functions in biological systems:
- **Catalysis:** They accelerate chemical reactions, allowing metabolic processes to occur at rates necessary for life.
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