PCR is used for

Options

A. Reverse transcribing RNA into DNA
B. Digesting DNA
C. Amplifying DNA
D. Amplifying proteins and separating DNA

Answer

**Step-by-Step Solution:**

1. **Understanding PCR**: PCR stands for Polymerase Chain Reaction. It is a technique used to amplify a specific segment of DNA, making millions of copies of a particular DNA sequence.

2. **Analyzing the Options**:
- **Option 1**: Reverse transcribing RNA into DNA - This process is known as reverse transcription, not PCR.
- **Option 2**: Digesting DNA - This refers to the process of cutting DNA into smaller fragments, typically using restriction enzymes, which is not the purpose of PCR.
- **Option 3**: Amplifying DNA - This is the primary function of PCR, where a small amount of DNA is exponentially amplified.
- **Option 4**: Amplifying proteins and separating DNA - PCR specifically amplifies DNA, not proteins.

3. **Conclusion**: Based on the analysis of the options, the correct answer is that PCR is used for amplifying DNA.

**Final Answer**: PCR is used for amplifying DNA.

---