Peptidoglycan (Murein) and amino acids in cell wall are found in

Options

A. Archaebacteria and Eukaryotes
B. Eubacteria and Protista
C. Monera and Protista
D. Bacteria and cyanobacteria

Answer

To answer the question about where peptidoglycan (murein) and amino acids in the cell wall are found, we can follow these steps:

### Step-by-Step Solution:

1. **Understand the Composition of Cell Walls**:
- Cell walls can be composed of various materials depending on the organism. For example, plants have cellulose, fungi have chitin, and bacteria have peptidoglycan.

2. **Analyze the Options**:
- The question provides four options:
- A) Archaeobacteria and Eukaryotes
- B) Eubacteria and Protista
- C) Monera and Protista
- D) Bacteria and Cyanobacteria

3. **Evaluate Archaeobacteria**:
- Archaeobacteria (or Archaea) have cell walls made of pseudo-peptidoglycan or polysaccharides and proteins, not true peptidoglycan. Therefore, option A is incorrect.

4. **Evaluate Eukaryotes**:
- Eukaryotes (which include plants, animals, and fungi) do not have peptidoglycan in their cell walls. Their cell walls are composed of cellulose, chitin, or other materials. Thus, option A is incorrect.

5. **Evaluate Eubacteria**:
- Eubacteria (true bacteria) have cell walls that are primarily made of peptidoglycan (murein) and amino acids. This makes option B partially correct, but we must also consider Protista.

6. **Evaluate Protista**:
- Protista generally do not have a cell wall, and if they do, it is not made of peptidoglycan. Therefore, option B is incorrect.

7. **Evaluate Monera**:
- Monera includes all bacteria, which means it encompasses both Eubacteria and Archaeobacteria. Since Archaeobacteria do not have peptidoglycan, option C is incorrect.

8. **Evaluate Bacteria and Cyanobacteria**:
- Both bacteria and cyanobacteria have cell walls made of peptidoglycan and amino acids. This makes option D correct.

9. **Final Answer**:
- The correct answer is **D) Bacteria and Cyanobacteria**.