Which of the following is the example of chemical scissors

Options

A. Eco RI
B. Hind III
C. Bam I
D. All of the above

Answer

To answer the question "Which of the following is the example of chemical scissors?", we need to identify the options provided and determine which ones qualify as chemical scissors, specifically restriction endonucleases.

### Step-by-Step Solution:

1. **Understanding Chemical Scissors**:
- Chemical scissors refer to restriction endonucleases, which are enzymes that cut DNA at specific sequences known as restriction sites.

2. **Reviewing the Options**:
- The options provided are:
- A) E. coli
- B) HindIII
- C) BamHI
- D) All of the above

3. **Analyzing Each Option**:
- **Option A: E. coli**:
- E. coli is a bacterium from which some restriction enzymes are derived. It can be considered an example of a source for restriction endonucleases.
- **Option B: HindIII**:
- HindIII is a specific restriction enzyme derived from the bacterium Haemophilus influenzae. It is indeed a chemical scissor.
- **Option C: BamHI**:
- BamHI is another restriction enzyme derived from Bacillus amyloliquefaciens. It also qualifies as a chemical scissor.

4. **Conclusion**:
- Since all three options (E. coli, HindIII, and BamHI) are related to restriction endonucleases, the correct answer is:
- **Option D: All of the above**.

### Final Answer:
The correct answer is **Option D: All of the above**.