In the ultra structure of cell membrane and its functions,

Options

A. Phospolipids are more than carbohydrates for signal
B. Prcteins are lesser than carbohydrates for fluidity.
C. The amount of phospholipids is highly variable for the transport of hydrophilic molecules.
D. The amount of protein is unequally distributed in the membrane for better transport.

Answer

### Step-by-Step Solution:

1. **Understanding the Cell Membrane Structure**: The cell membrane is primarily composed of a lipid bilayer, which consists mainly of phospholipids. This bilayer forms the fundamental structure of the membrane.

2. **Composition Breakdown**:
- **Phospholipids**: They make up about 80% of the cell membrane. Phospholipids have hydrophilic (water-attracting) heads and hydrophobic (water-repelling) tails, which help in forming the bilayer.
- **Proteins**: The protein content in the cell membrane varies between 20% to 70%. These proteins can be integral (spanning the membrane) or peripheral (attached to the surface).
- **Carbohydrates**: Carbohydrates are present in smaller amounts, typically around 1% to 5%. They are usually found attached to proteins (glycoproteins) or lipids (glycolipids) and play a role in cell recognition and signaling.

3. **Evaluating the Options**:
- **Option 1**: "Phospholipids are more than carbohydrates for signal." This is incorrect because while phospholipids are more abundant than carbohydrates, they are not primarily responsible for signaling.
- **Option 2**: "Proteins are lesser than carbohydrates for fluidity." This is also incorrect since proteins are more abundant than carbohydrates and contribute significantly to membrane fluidity.
- **Option 3**: "The amount of phospholipid is highly variable for the transport of hydrophobic molecules." This is incorrect because it is the proteins that facilitate the transport of hydrophobic molecules, not the phospholipids.
- **Option 4**: "The amount of protein is unequally distributed in the membrane for better transport." This is correct. The distribution of proteins varies, which is crucial for the transport functions of the membrane.

4. **Conclusion**: The correct answer is that the amount of protein is unequally distributed in the membrane for better transport.