Lipid molecule in plasma membrane are arranged in

Options

A. Alternately
B. In series
C. Parallel
D. Scattered.

Answer

To answer the question regarding how lipid molecules in the plasma membrane are arranged, we can follow these steps:

### Step-by-Step Solution:

1. **Understanding the Plasma Membrane Structure**:
The plasma membrane is primarily composed of lipid molecules, which are crucial for its structure and function.

2. **Identifying the Arrangement of Lipids**:
Lipid molecules in the plasma membrane are arranged in a specific manner. They form a bilayer, which is a key characteristic of the membrane.

3. **Describing the Bilayer**:
In the bilayer arrangement, there are two layers of lipid molecules. The hydrophobic (water-repelling) tails of the lipids face inward, away from water, while the hydrophilic (water-attracting) heads face outward, towards the aqueous environment inside and outside the cell.

4. **Evaluating the Options**:
Given the options:
- A) Alternatively
- B) In series
- C) Parallel
- D) Scattered

We analyze each:
- **Alternatively**: This arrangement does not provide the necessary protection and structure.
- **In series**: This does not accurately describe the lipid arrangement in the membrane.
- **Parallel**: This correctly describes the bilayer structure where the two layers of lipids are aligned parallel to each other.
- **Scattered**: This does not reflect the organized structure of the membrane.

5. **Conclusion**:
The correct answer is that lipid molecules in the plasma membrane are arranged in a **parallel** manner, forming a bilayer.

### Final Answer:
The lipid molecules in the plasma membrane are arranged in **parallel** (Option C).