Normal E.coli cells carry resistance against which of the following antibiotics ?

Options

A. Chloramphenicol
B. Ampicillin
C. Tetracycline
D. None of these

Answer

To answer the question about which antibiotics normal E. coli cells carry resistance against, we can follow these steps:

### Step-by-Step Solution:

1. **Understand the Question**: The question asks about the natural resistance of normal E. coli cells to specific antibiotics.

2. **Identify the Options**: The options provided are:
- A) Chloramphenicol
- B) Ampicillin
- C) Tetracycline
- D) None of these

3. **Research Normal E. coli**: Normal E. coli (Escherichia coli) cells are typically not resistant to antibiotics unless they have acquired resistance through genetic modifications or mutations.

4. **Analyze Each Antibiotic**:
- **Chloramphenicol**: Normal E. coli does not have inherent resistance.
- **Ampicillin**: Normal E. coli does not have inherent resistance.
- **Tetracycline**: Normal E. coli does not have inherent resistance.

5. **Conclusion**: Since normal E. coli does not possess natural resistance to any of the listed antibiotics, the correct answer is that they carry resistance against none of these antibiotics.

6. **Final Answer**: Therefore, the answer is option D) None of these.