Which among the following is regarded as molecular scissors?

Options

A. Reverse transcriptase
B. Restriction endonuclease
C. Exonucleases
D. Polymerases

Explanation

**Step-by-Step Solution:**

1. **Understanding the Question**: The question asks which of the given options is referred to as "molecular scissors." This term is commonly used in the context of biotechnology and genetics.

2. **Identifying the Options**: The options provided are:
- Reverse transcriptase
- Restriction endonuclease
- Exonuclease
- Polymerase

3. **Analyzing Each Option**:
- **Reverse Transcriptase**: This enzyme synthesizes DNA from an RNA template but does not cut DNA.
- **Restriction Endonuclease**: This enzyme is known for its ability to cut DNA at specific sequences, which is why it is often referred to as "molecular scissors."
- **Exonuclease**: This enzyme removes nucleotides from the ends of a DNA molecule but does not cut within the DNA strand.
- **Polymerase**: This enzyme synthesizes DNA or RNA from nucleotides but does not cut DNA.

4. **Conclusion**: Among the options, the only enzyme that cuts DNA at specific sites is the restriction endonuclease. Therefore, it is regarded as "molecular scissors."

5. **Final Answer**: The correct answer is **Restriction Endonuclease**.

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