Define bioactive molecules.

Explanation

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

1. **Definition of Bioactive Molecules**: Bioactive molecules are specific types of molecules that are produced as a result of microbial activities.

2. **Origin**: These molecules are synthesized by microorganisms, which include bacteria, fungi, and other microbes.

3. **Forms of Bioactive Molecules**: Bioactive molecules can exist in various forms, including:
- Enzymes: These are biological catalysts that speed up chemical reactions in the body.
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