The cell wall of yeast is composed of

Options

A. Cellulose
B. Pectose
C. Pectin
D. Chitin and mannan.

Answer

**Step-by-Step Solution:**

1. **Identify the Organism**: The question asks about the cell wall composition of yeast, which is a type of fungi. Yeast is classified as a unicellular fungus.

2. **Understand Fungal Cell Walls**: The cell walls of fungi, including yeast, are primarily made up of a specific material. This is different from the cell walls of plants and bacteria.

3. **Identify the Main Component**: The main component of the cell wall in fungi is **chitin**. Chitin is a polymer, which means it is made up of repeating units.

4. **Know the Building Block of Chitin**: Chitin is specifically a polymer of **N-acetylglucosamine (NAG)**. This means that NAG molecules link together to form chitin.

5. **Review Other Options**: The question may provide other options for the composition of the yeast cell wall. It is important to recognize that:
- **Cellulose** is found in the cell walls of plants and some bacteria, but not in fungi.
- **Pectin** and **pectose** are also components found in plant cell walls, not in fungi.
- The correct answer for the yeast cell wall composition is indeed **chitin**.

6. **Conclude the Answer**: Therefore, the cell wall of yeast is composed of **chitin**.

**Final Answer**: The cell wall of yeast is composed of **chitin**.

---