Choose the incorrect statement about the plasma membrane.

Options

A. The bilipid layer is made up of phosphoglycerides.
B. The membrane of the erythrocyte has approximately 40 per cent protein and 52 per cent lipids
C. Peripheral proteins lie on the surface of membrane while the integral proteins are partially or totally buried in the membrane.
D. The fluid nature of the membrane is important for functions like cell growth and formation of intercellular junctions.

Answer

To determine the incorrect statement about the plasma membrane, let's analyze each of the provided options step by step.

### Step 1: Analyze the First Statement
**Statement:** The lipid bilayer is made up of phosphoglycerides.

**Analysis:** This statement is correct. The plasma membrane is indeed composed of a lipid bilayer primarily made up of phospholipids, which are a type of phosphoglyceride.

**Conclusion:** This statement is **correct**.

### Step 2: Analyze the Second Statement
**Statement:** The membrane of erythrocytes has approximately 40% protein and 52% lipids.

**Analysis:** This statement is incorrect. The typical composition of the erythrocyte (red blood cell) membrane is approximately 52% protein and 40% lipid, with the remaining percentage being carbohydrates.

**Conclusion:** This statement is **incorrect**.

### Step 3: Analyze the Third Statement
**Statement:** Peripheral proteins lie on the surface of the membrane, while integral proteins are partially or totally buried in the membrane.

**Analysis:** This statement is correct. Peripheral proteins are indeed located on the surface of the membrane, while integral proteins can either be partially embedded or fully embedded within the lipid bilayer.

**Conclusion:** This statement is **correct**.

### Step 4: Analyze the Fourth Statement
**Statement:** The fluid nature of the membrane is important for functions like cell growth and the formation of intercellular junctions.

**Analysis:** This statement is correct. The fluid mosaic model of the plasma membrane suggests that the fluidity of the membrane is essential for various cellular processes, including cell growth and the formation of intercellular junctions.

**Conclusion:** This statement is **correct**.

### Final Conclusion
After analyzing all the statements, the **incorrect statement** about the plasma membrane is the second one: "The membrane of erythrocytes has approximately 40% protein and 52% lipids."

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