Cell wall of both bacteria and cyanobacteria contians

Options

A. Lipid
B. Pectin
C. Protein
D. Muramic acid

Answer

To answer the question about the components of the cell wall in both bacteria and cyanobacteria, we can follow these steps:

### Step-by-Step Solution:

1. **Identify the Cell Wall Composition**: Understand that the cell wall is a crucial structure in prokaryotic cells, which include both bacteria and cyanobacteria.

2. **Analyze the Options**: The options provided are:
- a. Lipid
- b. Pactin
- c. Protein
- d. Muramic acid

3. **Consider the Characteristics of Bacterial Cell Walls**: The primary component of bacterial cell walls is peptidoglycan, which contains muramic acid. This is a key distinguishing feature of prokaryotic cells.

4. **Cyanobacteria Cell Wall Composition**: Cyanobacteria, being a type of bacteria, also have a cell wall that contains peptidoglycan, and thus muramic acid is present in their cell walls as well.

5. **Conclude with the Correct Answer**: Since both bacteria and cyanobacteria contain muramic acid in their cell walls, the correct answer to the question is option D, Muramic acid.

### Final Answer:
The cell wall of both bacteria and cyanobacteria contains **Muramic acid (Option D)**.

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