This is true about phospholipids

Options

A. Amphipathic
B. Are not present in all cell membranes
C. `gt 80%` in plasma membrane
D. ` lt 20%`in plasma membrane

Answer

### Step-by-Step Solution:

1. **Understanding Phospholipids**:
- Phospholipids are a type of lipid molecule that are a fundamental component of cell membranes. They consist of a hydrophilic (water-attracting) "head" and two hydrophobic (water-repelling) "tails".

2. **Analyzing Statement A - Amphiphytic**:
- The term "amphiphytic" refers to molecules that have both hydrophilic and hydrophobic parts. Since phospholipids have a hydrophilic head and hydrophobic tails, this statement is **true**.

3. **Analyzing Statement B - Presence in Cell Membranes**:
- The statement claims that phospholipids are not present in all cell membranes. This is **false** because phospholipids are essential components of all biological membranes, forming the lipid bilayer.

4. **Analyzing Statement C - Percentage in Plasma Membrane**:
- The statement suggests that more than 80% of the plasma membrane is made up of phospholipids and less than 20% is made up of proteins. This is also **false**. In reality, while phospholipids are a major component, proteins also play a significant role in the structure and function of the plasma membrane, and the proportions can vary.

5. **Conclusion**:
- Based on the analysis, the only true statement about phospholipids is that they are amphiphytic. Therefore, the correct answer is **Option A: Amphiphytic**.