Most cell membranes are composed principally of

Options

A. DNA and ATP
B. protein and lipids
C. chitin and starch
D. nucleotides and amino acids.

Explanation

**Step-by-Step Solution:**

1. **Understanding Cell Membrane Composition**:
- Cell membranes are primarily composed of various biomolecules. The main components are phospholipids, proteins, cholesterol, and carbohydrates.

2. **Identifying the Major Component**:
- Phospholipids make up about 75% of the cell membrane. They form a bilayer that is crucial for the membrane's structure and function.

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