Apoenzyme is a
Non protein part of an conjugated enzyme
Protein part of a conjugated enzyme
Cofactor
Enzyme like molecule

Options

A. Non protein part of an congugated enzyme
B. Protein part of a conjugated enzyme
C. Cofactor
D. Enzyme like molecule

Answer

To solve the question regarding the definition of an apoenzyme, we can follow these steps:

### Step-by-Step Solution:

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

2. **Components of Enzymes**:
- Enzymes are typically composed of two main parts: the apoenzyme and the cofactor.
- The apoenzyme is the protein component of the enzyme.
- The cofactor is a non-protein component that can be either a metal ion or a coenzyme (which is often a vitamin or a derivative).

3. **Definition of Apoenzyme**:
- The apoenzyme is specifically the protein part of a conjugated enzyme. When an apoenzyme combines with its cofactor, it forms a holoenzyme (or conjugated enzyme), which is the active form of the enzyme.

4. **Analyzing the Options**:
- Now, let's analyze the options provided in the question:
- Non-protein part of a conjugated enzyme: This refers to the cofactor.
- Protein part of a conjugated enzyme: This correctly describes the apoenzyme.
- Cofactor: This is not the apoenzyme; it is a different component.
- Enzyme-like molecule: This does not accurately define an apoenzyme.

5. **Conclusion**:
- Based on the definitions and the analysis of the options, the correct answer is that the apoenzyme is the **protein part of a conjugated enzyme**.

### Final Answer:
**Protein part of a conjugated enzyme**

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