One of the following statements about cell membrane is wrong

Options

A. It is differentially permeable
B. It is made up of proteins only
C. It is found between the cell wall and protoplasm
D. It helps in endocytosis

Answer

To determine which statement about the cell membrane is incorrect, we need to analyze each option provided in the question. Here’s a step-by-step breakdown of the solution:

### Step 1: Understand the Properties of Cell Membrane
The cell membrane, also known as the plasma membrane, is a biological membrane that separates and protects the interior of all cells from the outside environment. It is known for its selective permeability.

### Step 2: Evaluate Each Statement
1. **Differentially permeable**: This statement is correct. The cell membrane is selectively permeable, meaning it allows certain substances to pass while restricting others.

2. **Made up of proteins only**: This statement is incorrect. The cell membrane is composed of a phospholipid bilayer with embedded proteins, cholesterol, and carbohydrates. It is not made up of proteins only.

3. **Found between the cell wall and the protoplasm**: This statement is correct. In plant cells, the cell membrane is located between the cell wall and the cytoplasm (protoplasm).

4. **Helps in endocytosis**: This statement is correct. The cell membrane plays a crucial role in endocytosis, which is the process by which cells take in substances by engulfing them.

### Step 3: Identify the Incorrect Statement
Based on the evaluation, the statement that is incorrect is: **"Made up of proteins only."** This is the wrong statement regarding the cell membrane.

### Conclusion
The correct answer is **option 2**, as it is the only statement that does not accurately describe the cell membrane.

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