Peptidoglycan (mucopeptide is found in walls of

Options

A. Only Gram+ve bacteria
B. Both Gram+ve and -ive bacteria
C. Gram+ve bacteria and fungi
D. Bacteria and green algae.

Answer

**Step-by-Step Solution:**

1. **Understanding Peptidoglycan**: Peptidoglycan, also known as mucopeptide or murine, is a polymer that forms a crucial part of the cell wall in bacteria. It provides structural support and shape to the bacterial cell.

2. **Identifying the Types of Bacteria**: There are two main types of bacteria based on their cell wall composition: Gram-positive and Gram-negative bacteria.

3. **Cell Wall Composition**:
- **Gram-positive Bacteria**: These bacteria have a thick layer of peptidoglycan in their cell walls. This thick layer retains the crystal violet stain used in the Gram staining procedure, which is why they appear purple under a microscope.
- **Gram-negative Bacteria**: These bacteria have a thinner layer of peptidoglycan, located between an outer membrane and the inner cell membrane. They do not retain the crystal violet stain and instead take up the counterstain, appearing pink.

4. **Conclusion**: Since peptidoglycan is found in the cell walls of both Gram-positive and Gram-negative bacteria, the correct answer to the question is that peptidoglycan is found in the walls of both types of bacteria.

5. **Final Answer**: Therefore, the correct option is **B: both Gram-positive and Gram-negative bacteria**.

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