if the DNA of a virus is labelled with `32_(P)` and the protein of the virus is labelled with `.^(32p)` and the protein of the virus is labelled with `^(35)S`, after transduction which molecule (s) would be present inside the bacterial cells ?

Options

A. `.^(32)P only
B. `.^(35 )S only
C. Both (a) and (b)
D. None of these

Explanation

To solve the question, we need to analyze the information given about the labeling of the virus's DNA and protein and understand the process of transduction.

### Step-by-Step Solution:

1. **Understanding the Labels**:
- The DNA of the virus is labeled with \(^{32}P\) (a radioactive isotope of phosphorus).
- The protein of the virus is labeled with \(^{35}S\) (a radioactive isotope of sulfur).

2. **Transduction Process**:
- Transduction is a process where a virus (bacteriophage) transfers genetic material from one bacterium to another.
- In this case, the virus infects bacterial cells and can introduce its genetic material (DNA) into the bacterial cell.

3. **Identifying Genetic Material**:
- Historically, experiments (like those by Hershey and Chase) have shown that DNA, not protein, is the genetic material that gets transferred during viral infection.
- The radioactive labeling indicates which components are being transferred. Since the DNA is labeled with \(^{32}P\), it will be incorporated into the bacterial cells.

4. **Result of Infection**:
- After the transduction, the bacterial cells will contain the viral DNA labeled with \(^{32}P\).
- The protein labeled with \(^{35}S\) does not enter the bacterial cells and remains outside, as proteins do not serve as genetic material.

5. **Conclusion**:
- Therefore, after transduction, the only molecule that would be present inside the bacterial cells is the DNA labeled with \(^{32}P\).

### Final Answer:
The molecule present inside the bacterial cells after transduction would be \(^{32}P\) (DNA).