The biological scissors are :
i. Restriction enzymes are used to cut DNA into nucleotide monomers.
ii. Enzymes always cut the DNA at specific nucleotide sequences.
iii. Present variously recognizing and cutting different DNA sequences.
Select the option with the correct statement/s.

Options

A. i and ii
B. ii and iii
C. i and iii
D. i, ii and iii

Answer

To solve the question regarding the biological scissors, we need to evaluate each statement provided:

1. **Statement i**: "Restriction enzymes are used to cut DNA into nucleotide monomers."
- **Evaluation**: This statement is incorrect. Restriction enzymes (also known as restriction endonucleases) do cut DNA, but they do not cut it into individual nucleotide monomers. Instead, they cut DNA at specific sites, producing fragments of varying lengths, not single nucleotides.

2. **Statement ii**: "Enzymes always cut the DNA at specific nucleotide sequences."
- **Evaluation**: This statement is correct. Restriction enzymes are designed to recognize and cut DNA at specific sequences of nucleotides. Each enzyme has a particular recognition site where it will make a cut.

3. **Statement iii**: "Present variously recognizing and cutting different DNA sequences."
- **Evaluation**: This statement is also correct. Different restriction enzymes recognize different specific sequences of DNA and cut at those sites. This diversity allows for various applications in genetic engineering and molecular biology.

Based on the evaluations:
- Statement i is incorrect.
- Statements ii and iii are correct.

Thus, the correct option with the right statements is the one that includes only statements ii and iii.

### Final Answer:
The correct statements are ii and iii.