In their side by side experiments Hershey and Chase incorporated `""^(35)S` into

Options

A. Bacterial DN
B. Protein capsid of phage
C. Cytoplasm of bacteria
D. Phage DNA

Answer

**Step-by-Step Solution:**

1. **Understanding the Experiment**: The Hershey and Chase experiment was conducted to determine whether DNA or protein was the genetic material in viruses that infect bacteria (bacteriophages).

2. **Radioactive Isotopes Used**: In their experiment, Hershey and Chase used two different radioactive isotopes: Phosphorus-32 (P32) and Sulfur-35 (S35). P32 was used to label DNA, as DNA contains phosphorus, while S35 was used to label proteins, as proteins contain sulfur.

3. **Incorporation of S35**: The question specifically asks about the incorporation of S35. In the experiment, S35 was incorporated into the protein coat (capsid) of the bacteriophage.

4. **Infection Process**: After the bacteriophages were labeled with S35, they were allowed to infect bacterial cells. The key observation was that the bacteria infected with the S35-labeled phages did not show signs of infection because the genetic material (DNA) did not enter the bacteria; only the protein coat did.

5. **Conclusion**: The results indicated that the genetic material responsible for infection and replication was DNA, which was labeled with P32, while the S35 labeled the protein coat. Therefore, the correct answer to the question is that S35 was incorporated into the protein capsid of the bacteriophage.

**Final Answer**: S35 was incorporated into the protein capsid.

---