In Gram positive bacteria, the peptidoglycan layer constitutes

Options

A. `10%` of the cell wall
B. `30%` of the cell wall
C. `70%` of the cell wall
D. `90%` of the cell wall

Answer

**Step-by-Step Solution:**

1. **Understanding Bacteria Classification**: Bacteria are classified into two main categories based on their cell wall structure and staining properties: Gram-positive and Gram-negative bacteria.

2. **Characteristics of Gram-positive Bacteria**: In Gram-positive bacteria, the cell wall is notably thick compared to that of Gram-negative bacteria. This thick cell wall is primarily composed of peptidoglycan.

3. **Composition of Peptidoglycan**: Peptidoglycan, also known as murine, is a polymer made up of sugars and amino acids. It provides structural support to the bacterial cell wall.

4. **Proportion of Peptidoglycan**: In Gram-positive bacteria, the peptidoglycan layer constitutes about 70% of the cell wall. This is significantly higher than in Gram-negative bacteria, where the peptidoglycan layer constitutes only about 10-20%.

5. **Conclusion**: Therefore, the peptidoglycan layer in Gram-positive bacteria is a major component of their cell wall, making up approximately 70% of it.

**Final Answer**: In Gram-positive bacteria, the peptidoglycan layer constitutes approximately 70% of the cell wall.

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