Part of enzyme which combines with non-protein part to form fuctional enzymes is

Options

A. Apoenzyme
B. Coenzymes
C. Prosthetic group
D. None of the above.

Answer

To solve the question "Part of enzyme which combines with non-protein part to form functional enzymes is," we will break it down step by step.

### Step-by-Step Solution:

1. **Understanding Enzymes**: Enzymes are biological catalysts that speed up chemical reactions in living organisms. They are typically made up of proteins, but they can also contain non-protein components.

2. **Defining Holoenzyme**: The complete and functional enzyme is referred to as a holoenzyme. A holoenzyme consists of two main components: the apoenzyme and the cofactor.

3. **Identifying Apoenzyme**: The apoenzyme is the protein part of the enzyme. It is inactive on its own and requires a non-protein component to become functional.

4. **Understanding Cofactors**: Cofactors are non-protein parts that can be further classified into two categories: coenzymes and prosthetic groups.

- **Coenzymes**: These are organic molecules that are loosely bound to the apoenzyme.
- **Prosthetic Groups**: These can be either organic or inorganic and are tightly bound to the enzyme.

5. **Combining Components**: The question asks for the part of the enzyme that combines with the non-protein part to form a functional enzyme. Since the apoenzyme is the protein part that combines with the non-protein cofactor (which can be a coenzyme or prosthetic group), the correct answer to the question is the apoenzyme.

6. **Final Answer**: Therefore, the part of the enzyme which combines with the non-protein part to form functional enzymes is **apoenzyme**.