Which of the following is not the part of Heavy Meromyosin (HMM) ?

Options

A. Globular head
B. Short arm
C. Binding site for actin
D. Binding site for Tropomyosin

Answer

To solve the question "Which of the following is not the part of Heavy Meromyosin (HMM)?", we can follow these steps:

### Step 1: Understand the Structure of Myosin
Myosin is a protein that plays a crucial role in muscle contraction. It has two main fragments: Heavy Meromyosin (HMM) and Light Meromyosin (LMM).

### Step 2: Identify the Components of Heavy Meromyosin
Heavy Meromyosin consists of:
- A globular head
- A short arm
- An ATP binding site
- An actin binding site

### Step 3: Recognize the Role of Tropomyosin
Tropomyosin is a protein that is associated with the thin filament in muscle fibers. It does not form part of the Heavy Meromyosin structure.

### Step 4: Determine the Correct Answer
Since tropomyosin is not a component of Heavy Meromyosin, the correct answer to the question is "Binding site for tropomyosin".

### Final Answer
The part that is not a component of Heavy Meromyosin is the "Binding site for tropomyosin".

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