The prosthetic group of a conjugated protein classified as a glycoprotein is a :

Options

A. chromophoric group
B. polysaccharide
C. metal ion
D. lipid

Explanation

To solve the question regarding the prosthetic group of a conjugated protein classified as a glycoprotein, we can follow these steps:

### Step-by-Step Solution:

1. **Understand Conjugated Proteins**:
- Conjugated proteins are proteins that are bound to non-protein components. These non-protein components are known as prosthetic groups.

2. **Identify Glycoproteins**:
- Glycoproteins are a type of conjugated protein where the non-protein component is a carbohydrate. They consist of proteins that are covalently bonded to polysaccharides.

3. **Determine the Nature of the Prosthetic Group**:
- In glycoproteins, the prosthetic group is specifically a carbohydrate, which is made up of polysaccharides.

4. **Analyze the Options**:
- Option 1: Chromophoric group - This refers to a group that can absorb light, not relevant here.
- Option 2: Polysaccharide - This is a carbohydrate, which is indeed the prosthetic group in glycoproteins.
- Option 3: Metal ion - Metal ions are not typically considered prosthetic groups in glycoproteins.
- Option 4: Lipid - Lipids are not the prosthetic group in glycoproteins.

5. **Select the Correct Answer**:
- Based on the analysis, the correct answer is **polysaccharide**, as it is the prosthetic group of glycoproteins.

### Final Answer:
The prosthetic group of a conjugated protein classified as a glycoprotein is a **polysaccharide**.