Shape of E.coli is-

Options

A. Rod shaped
B. Round
C. Spiral
D. Comma shaped

Answer

### Step-by-Step Solution:

1. **Identify the Organism**: The question asks about the shape of E. coli, which is a type of bacteria.

2. **Understand the Classification**: E. coli is classified as a gram-negative bacterium. This classification is important as it provides insights into its structure and characteristics.

3. **Determine the Shape**: The specific shape of E. coli is described as rod-shaped. This is a key characteristic of this bacterium.

4. **Arrangement of Cells**: E. coli can exist either singly or in pairs. This means that while they are rod-shaped, they can be found alone or connected to another bacterium.

5. **Motility**: E. coli is motile due to the presence of peritrichous flagella, which are hair-like structures that allow it to move.

6. **Spore Formation**: E. coli does not form spores, which means it is classified as non-sporing.

7. **Cell Wall Composition**: The cell wall of E. coli contains 1 or 2 layers of peptidoglycan, which is a characteristic feature of bacterial cell walls.

8. **Habitat and Growth Conditions**: E. coli is facultative anaerobic, meaning it can survive in both aerobic and anaerobic conditions. Its optimal temperature range for growth is between 15 to 45 degrees Celsius.

9. **Final Answer**: Based on the information gathered, the shape of E. coli is rod-shaped.