prosthetic group is a part of holoenzyme it is

Options

A. inorganic part loosely attached
B. accessory non prtoein organic substance attached firmly
C. organic part attached loosely
D. none of these

Answer

To answer the question regarding the nature of a prosthetic group as part of a holoenzyme, we can break down the solution into the following steps:

### Step-by-Step Solution:

1. **Understanding Holoenzyme**: A holoenzyme is a complete enzyme that consists of an apoenzyme (the protein part) and a cofactor. The cofactor can be either a metal ion or an organic molecule.

2. **Defining Prosthetic Group**: A prosthetic group is a specific type of cofactor that is tightly and permanently attached to the enzyme. It is essential for the enzyme's activity.

3. **Types of Cofactors**: Cofactors can be classified into two categories:
- **Loosely attached cofactors**: These can be removed without destroying the enzyme's structure.
- **Tightly attached prosthetic groups**: These are firmly bound to the enzyme and are not easily removed.

4. **Identifying the Nature of Prosthetic Groups**: Prosthetic groups are typically organic molecules, which means they contain carbon and are derived from living organisms. Examples include NAD (Nicotinamide adenine dinucleotide) and FAD (Flavin adenine dinucleotide).

5. **Analyzing the Options**: The question provides several options:
- Organic part loosely attached
- Accessory non-protein organic substance attached firmly
- Organic part attached loosely
- None of these

6. **Selecting the Correct Option**: Since a prosthetic group is a non-protein organic substance that is firmly attached to the enzyme, the correct answer is "Accessory non-protein organic substance attached firmly."

### Final Answer:
The prosthetic group is a part of a holoenzyme and is an accessory non-protein organic substance attached firmly.

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