(a) Hershey and Chase carried their experiment in three steps : infection, blending, centrifugation. Explain each step.
(b) Write the conclusion and interpretation of the result they obtained.

Explanation

### Step-by-Step Text Solution

**(a) Explanation of the Three Steps:**

1. **Infection:**
- In this initial step, Alfred Hershey and Martha Chase used bacteriophages, which are viruses that infect bacteria. They prepared two sets of bacteriophages: one set was labeled with radioactive phosphorus (32P) and the other with radioactive sulfur (35S).
- The bacteriophages were allowed to infect bacterial cells. During this process, the bacteriophages attached to the surface of the bacteria and injected their genetic material (DNA) into the host cells. The protein coat of the bacteriophage remained outside the bacterial cell.

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