Which one of the following does not differ in E. coli and Chlamydomonas

Options

A. Chromosomal organization
B. Cell wall
C. Cell membrane
D. Ribosomes

Answer

To solve the question "Which one of the following does not differ in E. coli and Chlamydomonas?", we need to analyze the characteristics of both organisms.

### Step-by-Step Solution:

1. **Identify the Organisms**:
- E. coli is a prokaryotic organism (a bacterium).
- Chlamydomonas is a eukaryotic organism (a green alga).

2. **Understand the Key Differences**:
- Prokaryotic cells (like E. coli) do not have a nucleus or membrane-bound organelles, while eukaryotic cells (like Chlamydomonas) have a defined nucleus and organelles.
- E. coli does not have histone proteins associated with its DNA, while Chlamydomonas does.

3. **Compare Cell Membrane Structure**:
- The structure of the cell membrane is fundamentally similar in both prokaryotic and eukaryotic cells. Both types of cells have a phospholipid bilayer that serves as a barrier and is involved in various cellular processes.

4. **Analyze the Options**:
- Based on the understanding of the structural differences and similarities, we can conclude that the cell membrane structure does not differ between E. coli and Chlamydomonas.

5. **Select the Correct Answer**:
- Therefore, the correct answer to the question is the option that states the similarity in cell membrane structure.

### Conclusion:
- The correct answer is **option 3** (the one that states the similarity in cell membrane structure).