In human beings, the membrane of the erythrocyte has approximately ___________(i)___________ protein and __________(ii)__________ lipids.

Options

A. (i) 40%, (ii) 52%
B. (i) 34%, (ii) 58%
C. (i) 52%, (ii) 40%
D. (i) 58%, (ii) 34%

Answer

To solve the question, we need to determine the approximate percentages of protein and lipids present in the membrane of erythrocytes (red blood cells) in human beings.

### Step-by-Step Solution:

1. **Understanding Erythrocyte Membrane Composition**:
- The membrane of erythrocytes consists of a lipid bilayer and proteins. The lipid bilayer is primarily made up of phospholipids.

2. **Identifying the Proportions**:
- In human erythrocytes, the composition of the membrane is not equal between proteins and lipids. It is important to note that while lipids form the structural basis of the membrane, proteins play crucial roles in various functions.

3. **Protein Content**:
- The integral proteins in the erythrocyte membrane include hemoglobin, which is a metalloprotein. This contributes significantly to the overall protein content. The approximate percentage of protein in the erythrocyte membrane is around 52%.

4. **Lipid Content**:
- The lipid component, while essential, is present in a lesser amount compared to proteins. The approximate percentage of lipids in the erythrocyte membrane is around 40%.

5. **Final Answer**:
- Therefore, the membrane of the erythrocyte has approximately **52% protein** and **40% lipids**.

### Summary of the Answer:
- (i) 52% protein
- (ii) 40% lipids