Prosthetic groups are organic compounds and are tightly bound to the apoenzyme. Haem is the prosthetic group of :-

Options

A. Peroxidase
B. Catalase
C. Carboxypeptidase
D. (1) and (2) both

Answer

To answer the question regarding the prosthetic group "haem" and its association with specific enzymes, we can follow these steps:

### Step-by-Step Solution:

1. **Understand the Definition of Prosthetic Groups**:
Prosthetic groups are non-polypeptide units that are tightly bound to proteins (apoenzymes) and are essential for their biological activity. They can be organic compounds or metal ions.

**Hint**: Recall that prosthetic groups are crucial for the function of certain enzymes and are not easily removed.

2. **Identify the Role of Haem**:
Haem is an iron-containing prosthetic group that plays a significant role in various biological processes, particularly in oxygen transport and electron transfer.

**Hint**: Think about where haem is commonly found and its functions in biological systems.

3. **List the Enzymes Mentioned**:
The options provided are:
- Peroxidase
- Catalase
- Carboxypeptidase
- Both peroxidase and catalase

**Hint**: Consider the functions of these enzymes and whether they require a prosthetic group.

4. **Determine the Enzymes Associated with Haem**:
Haem is specifically known to be a prosthetic group for enzymes like catalase and peroxidase. Both of these enzymes are involved in the breakdown of hydrogen peroxide.

**Hint**: Recall the specific functions of catalase and peroxidase related to hydrogen peroxide.

5. **Evaluate Carboxypeptidase**:
Carboxypeptidase does not contain haem as a prosthetic group; instead, it typically has zinc as its prosthetic group.

**Hint**: Remember that not all enzymes require haem; some may use different metal ions.

6. **Conclude the Correct Answer**:
Since haem is a prosthetic group for both peroxidase and catalase, the correct answer is that haem is the prosthetic group of both peroxidase and catalase.

**Hint**: Look for options that include both peroxidase and catalase as they are the correct associations for haem.

### Final Answer:
Haem is the prosthetic group of both peroxidase and catalase.