The approximate percentage of proteins and lipids in the cell membrane of human erythrocyte respectively is

Options

A. 40 and 52
B. 42 and 50
C. 52 and 40
D. 48 and 52

Answer

To determine the approximate percentage of proteins and lipids in the cell membrane of human erythrocytes (red blood cells), we can follow these steps:

### Step-by-Step Solution:

1. **Understand the Composition of the Cell Membrane:**
- The cell membrane of human erythrocytes is composed of various biomolecules, including proteins, lipids, carbohydrates, and cholesterol.

2. **Identify the Key Components:**
- The primary components of the erythrocyte membrane include:
- Proteins
- Lipids
- Carbohydrates (in smaller amounts)
- Cholesterol (also in smaller amounts)

3. **Know the Approximate Percentages:**
- According to biological studies, the approximate percentages of proteins and lipids in the cell membrane of human erythrocytes are:
- Proteins: 40%
- Lipids: 52%

4. **Select the Correct Option:**
- Given the options provided in the question, the correct pair representing the approximate percentages of proteins and lipids in the erythrocyte membrane is:
- Proteins: 40%
- Lipids: 52%
- Therefore, the correct answer is the first option: 40% proteins and 52% lipids.

### Final Answer:
The approximate percentage of proteins and lipids in the cell membrane of human erythrocytes is **40% and 52%**, respectively.

---