The protein component of a holoenzyme is known as

Options

A. Coenzyme
B. Cofactor
C. Prosthetic group
D. Apoenzyme

Answer

To solve the question, "The protein component of a holoenzyme is known as," we can follow these steps:

### Step-by-Step Solution:

1. **Understand the term "Holoenzyme":**
- A holoenzyme is an active enzyme that consists of two main components: the apoenzyme and a non-protein component (which can be a coenzyme or a cofactor).

2. **Identify the components of a holoenzyme:**
- The holoenzyme is made up of:
- **Apoenzyme:** This is the protein part of the enzyme.
- **Coenzyme/Cofactor:** These are the non-protein parts that assist in enzyme activity. Coenzymes are often organic molecules, while cofactors can be metal ions.

3. **Determine the protein component:**
- Since the apoenzyme is defined as the protein part of the holoenzyme, we can conclude that the protein component of a holoenzyme is the apoenzyme.

4. **Review the options given:**
- The options provided are:
- Coenzyme
- Cofactor
- Prosthetic Group
- Apoenzyme
- Among these, the only option that refers to the protein component is the apoenzyme.

5. **Final Answer:**
- Therefore, the protein component of a holoenzyme is known as **Apoenzyme**.