Which of the following is a restriction endonuclease

Options

A. Protease
B. DNAase I
C. Rnase
D. Hind II

Answer

**Step-by-Step Solution:**

1. **Understanding the Question**: The question asks to identify which of the given options is a restriction endonuclease.

2. **Defining Restriction Endonuclease**: Restriction endonucleases are enzymes that cut DNA at specific recognition sites. They recognize specific nucleotide sequences and cleave the DNA at or near these sites.

3. **Analyzing the Options**:
- **Option A: Protease**: Proteases are enzymes that break down proteins. They do not act on nucleic acids, so this option is incorrect.
- **Option B: DNAs**: DNAs (deoxyribonucleases) are enzymes that degrade DNA but do not necessarily cut at specific recognition sites like restriction endonucleases do. Therefore, this option is also incorrect.
- **Option C: RNAs**: RNAs (ribonucleases) are enzymes that degrade RNA. Similar to DNAs, they do not function as restriction endonucleases, making this option incorrect as well.
- **Option D: Hintu**: Hintu is a specific type of restriction endonuclease. It cuts DNA at specific palindromic sequences, making it the correct choice.

4. **Conclusion**: After analyzing all the options, the only correct answer is **Option D: Hintu**, as it is a restriction endonuclease that cuts DNA at specific sites.

**Final Answer**: The restriction endonuclease among the options is **Hintu** (Option D).

---