The source of the restriction enzyme Hindll is

Options

A. Escherichia coli `RY 13`
B. Haemophilus influenzae Rd
C. Bacillus amyloliuefaciens `H`
D. Streptomyces albus

Answer

**Step-by-Step Solution:**

1. **Understanding Restriction Enzymes:**
- Restriction enzymes, also known as restriction endonucleases, are proteins that cut DNA at specific sequences. They are commonly used in molecular biology for cloning and DNA manipulation.

2. **Identifying the Source of HindIII:**
- The question asks for the source of the restriction enzyme HindIII. To answer this, we need to identify the organism from which this enzyme is derived.

3. **Analyzing the Options:**
- The options provided are:
- A) Escherichia coli RY13
- B) Haemophilus influenzae RD
- C) Bacillus amylolequefaciens H
- D) Streptomyces albus

4. **Evaluating Each Option:**
- **Option A: Escherichia coli RY13**
- This strain is known for producing the restriction enzyme EcoRI, not HindIII. Therefore, this option is incorrect.
- **Option B: Haemophilus influenzae RD**
- HindIII is indeed derived from this strain of Haemophilus influenzae. This option is correct.
- **Option C: Bacillus amylolequefaciens H**
- This bacterium produces the restriction enzyme BamHI, not HindIII. Thus, this option is incorrect.
- **Option D: Streptomyces albus**
- This organism produces the restriction enzyme SalI, not HindIII. Therefore, this option is also incorrect.

5. **Conclusion:**
- The correct answer is **B) Haemophilus influenzae RD**, as this is the source of the restriction enzyme HindIII.

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