(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 Solution

**(a) Explanation of the three steps of the Hershey and Chase experiment:**

1. **Infection:**
- In this initial step, Hershey and Chase used bacteriophages (viruses that infect bacteria) to infect E. coli bacteria. They labeled the bacteriophages with radioactive isotopes: sulfur-35 (S-35) to label the protein coat and phosphorus-32 (P-32) to label the DNA. When the labeled bacteriophages were introduced to the E. coli, they attached to the bacterial surface and injected their genetic material (DNA) into the bacteria.

**Hint:** Remember that the purpose of this step was to determine which part of the bacteriophage (protein or DNA) was responsible for carrying genetic information into the bacteria.
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