What is the chemical nature of enzymes ?

Explanation

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

1. **Understanding Enzymes**: Enzymes are biological catalysts that speed up chemical reactions in living organisms. They play a crucial role in various metabolic processes.

2. **Chemical Composition**: The primary chemical nature of enzymes is predominantly protein. This means that most enzymes are made up of long chains of amino acids that fold into specific three-dimensional shapes, allowing them to perform their catalytic functions.

3. **Exceptions**: While most enzymes are proteins, there are exceptions. Some nucleic acids, specifically certain types of RNA, can also function as enzymes. These RNA molecules are known as ribozymes.

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