Give the chemical nature of plasma membrane.

Explanation

### Step-by-Step Solution:

1. **Understanding the Plasma Membrane**: The plasma membrane, also known as the cell membrane, is a vital structure that surrounds the cell, providing it with protection and structural support.

2. **Composition of the Plasma Membrane**: The plasma membrane is primarily composed of a bilayer of phospholipids. Phospholipids are molecules that have a hydrophilic (water-attracting) "head" and two hydrophobic (water-repelling) "tails."

3. **Phospholipid Bilayer**: In the plasma membrane, phospholipids arrange themselves in a bilayer. The hydrophilic heads face outward towards the aqueous environment, while the hydrophobic tails face inward, away from water. This arrangement is crucial for maintaining the integrity of the cell.

...