The non protein part of enzyme is called

Options

A. Apoenzyme
B. Prosthetic group
C. Coenzyme
D. 2 & 3

Answer

To answer the question, "The non-protein part of an enzyme is called," we need to understand the structure of enzymes and their components. Here's the step-by-step solution:

### Step-by-Step Solution:

1. **Understanding Enzymes**: Enzymes are biological catalysts that speed up chemical reactions in the body by lowering the activation energy required for the reaction to occur.

2. **Components of Enzymes**: Enzymes are typically composed of two main parts:
- **Apoenzyme**: This is the protein part of the enzyme. It is the inactive form of the enzyme that requires a non-protein component to become active.
- **Cofactor**: This is the non-protein part of the enzyme that is necessary for the enzyme's activity.

3. **Types of Cofactors**: The cofactor can be further classified into:
- **Prosthetic Group**: This is a cofactor that is tightly bound to the apoenzyme.
- **Coenzyme**: This is a cofactor that is loosely bound to the apoenzyme and can be easily removed.

4. **Identifying the Non-Protein Part**: Since the question specifically asks for the non-protein part of the enzyme, we focus on the cofactor, which includes both the prosthetic group and the coenzyme.

5. **Conclusion**: Therefore, the non-protein part of an enzyme is referred to as the **cofactor**.

### Final Answer:
The non-protein part of an enzyme is called the **cofactor**.