The name biological scissors is given to

Options

A. Enzymes
B. restriction endonucleases
C. restriction exonucleases
D. restriction DNAse

Answer

**Step-by-Step Solution:**

1. **Understanding the Term "Biological Scissors":**
- The term "biological scissors" refers to a type of enzyme that can cut DNA molecules at specific sites.

2. **Identifying the Options:**
- Option 1: Enzymes
- Option 2: Restriction endonucleases
- Option 3: Restriction exonucleases
- Option 4: Restriction DNS

3. **Analyzing Each Option:**
- **Enzymes:** While enzymes are biological catalysts, they are not specifically known for cutting DNA.
- **Restriction Endonucleases:** These are enzymes that cut DNA at specific sequences, making them the most suitable candidates for the term "biological scissors."
- **Restriction Exonucleases:** These enzymes remove nucleotides from the ends of DNA molecules, but they do not cut at specific sites within the DNA.
- **Restriction DNS:** This option does not refer to a known biological entity.

4. **Conclusion:**
- Based on the analysis, the correct answer is **Option 2: Restriction endonucleases**. They are specifically designed to cut DNA at precise locations, which is why they are referred to as "biological scissors."