Cell wall of bacteria// cyanobacteria possesses

Options

A. Chitin
B. Murein//Mucopeptide
C. Peptidoglycan and amino sugars
D. Both B and C.

Answer

### Step-by-Step Solution:

1. **Understanding the Question**: The question asks about the composition of the cell wall in bacteria and cyanobacteria.

2. **Identifying the Key Components**: The cell wall of bacteria and cyanobacteria is primarily composed of peptidoglycan. Peptidoglycan is a polymer that consists of sugars and amino acids.

3. **Defining Peptidoglycan**: Peptidoglycan is made up of two main components:
- **N-acetylmuramic acid** (also referred to as murine)
- **N-acetylglucosamine** (which can also be referred to as amino sugar)

4. **Evaluating the Options**:
- **Chitin**: This is incorrect, as chitin is found in the cell walls of fungi, not bacteria.
- **Murine or Mucopeptide**: This is correct, as it refers to the components of peptidoglycan.
- **Peptidoglycan**: This is also correct, as it is the main structural component of the bacterial cell wall.
- **Amino Sugar**: This is correct since peptidoglycan contains amino sugars.
- **Both B and C**: This option is also correct because it includes both murine and peptidoglycan.

5. **Conclusion**: The correct answer is **option D: Both B and C**, as the cell wall of bacteria and cyanobacteria possesses both peptidoglycan and amino sugars.