Coenzyme is a part of enzyme

Options

A. inorganic metal activator
B. nonprotein organic part attached firmly
C. nonprotein orgainc part attached lossely
D. vitamin A

Answer

**Step-by-Step Solution:**

1. **Understanding Enzymes**: Enzymes are biological catalysts that speed up chemical reactions in living organisms. They are made up of proteins and can have additional components that assist in their function.

2. **Defining Holoenzyme**: The complete, active form of an enzyme is referred to as a holoenzyme. It consists of two main components: the apoenzyme and the cofactor.

3. **Identifying Apoenzyme**: The apoenzyme is the protein part of the enzyme. It is the inactive form of the enzyme that requires a cofactor to become active.

4. **Understanding Cofactors**: Cofactors are non-protein components that assist enzymes in their activity. They can be further classified into three types:
- **Prosthetic Group**: This is an organic molecule that is tightly bound to the apoenzyme.
- **Coenzyme**: This is also an organic molecule but is loosely attached to the apoenzyme and is involved in the enzyme's activity for a transient period.
- **Metal Ions**: These are inorganic ions that can also act as cofactors.

5. **Focusing on Coenzyme**: A coenzyme is specifically a type of cofactor that is an organic molecule. It is loosely attached to the apoenzyme and plays a crucial role in the enzyme's function during the reaction.

6. **Conclusion**: Therefore, the statement "Coenzyme is a part of enzyme" is correct, and specifically, a coenzyme is a non-protein organic part that is loosely attached to the apoenzyme.

**Final Answer**: Coenzyme is a non-protein organic part that is loosely attached to the apoenzyme.

---