Secondary structure of protein, which is attached to lipid layer and lining the pores of cell membrane will be

Options

A. `alpha` - Helix
B. `beta` - Strand
C. `beta` - chain
D. Random

Answer

To solve the question about the secondary structure of protein that is attached to the lipid layer and lines the pores of the cell membrane, we can follow these steps:

### Step-by-Step Solution:

1. **Understand the Question**: The question asks about the secondary structure of a protein that is associated with the lipid layer and the lining of pores in the cell membrane.

2. **Identify the Options**: The options provided are:
- a. alpha helix
- b. beta strand
- c. B chain
- d. random

3. **Analyze Each Option**:
- **B chain**: This refers to branched-chain amino acids. These are not a type of secondary structure, so this option can be eliminated.
- **Random**: A random structure does not represent a specific secondary structure of proteins. Therefore, this option is also incorrect.
- **Beta strand**: This structure is part of beta sheets, which are common in proteins but do not specifically relate to the lining of pores in cell membranes. Thus, this option is not the answer.
- **Alpha helix**: This is a common secondary structure of proteins characterized by a coiled shape. It is often found in membrane proteins and can be involved in forming pores in the cell membrane.

4. **Conclusion**: Based on the analysis, the secondary structure of the protein that is attached to the lipid layer and lines the pores of the cell membrane is the **alpha helix**. Therefore, the correct answer is option **a. alpha helix**.

### Final Answer:
The secondary structure of protein attached to the lipid layer and lining the pores of the cell membrane is **a. alpha helix**.

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