Correct sequence of protein (P) and lipid (L) in cell membrane is (as per lamellar model)

Options

A. L-P-L-P
B. L-P-P-L
C. P-L-L-P
D. P-P-L-L

Answer

To determine the correct sequence of proteins (P) and lipids (L) in the cell membrane according to the lamellar model, we can follow these steps:

### Step-by-Step Solution:

1. **Understand the Structure of the Cell Membrane**: The cell membrane is primarily composed of a bilayer of phospholipids with proteins embedded within it. This structure is often described by the fluid mosaic model.

2. **Identify Components**: In the cell membrane, lipids (L) form the bilayer, while proteins (P) can be either integral (spanning the membrane) or peripheral (attached to the surface).

3. **Analyze the Options**: We have four options to consider:
- a. LPLP
- b. LPPL
- c. PLLP
- d. PPLL

4. **Determine the Sequence**: According to the lamellar model, the arrangement typically has lipids forming the bilayer with proteins interspersed. The correct sequence would start and end with lipids, with proteins in between.

5. **Evaluate Each Option**:
- **Option a (LPLP)**: Starts and ends with lipids, but has proteins in between, which does not represent the bilayer structure accurately.
- **Option b (LPPL)**: Starts with lipid, then protein, but does not maintain the correct bilayer structure.
- **Option c (PLLP)**: Starts with protein, which is not typical for the bilayer structure.
- **Option d (PPLL)**: Starts with protein and does not represent the bilayer structure accurately.

6. **Select the Correct Answer**: The correct sequence according to the lamellar model is **c. PLLP**, as it represents the arrangement of proteins and lipids in a way that aligns with the bilayer structure.

### Final Answer:
The correct sequence of protein (P) and lipid (L) in the cell membrane as per the lamellar model is **c. PLLP**.

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