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The correct answer to the question is:
- DNA can be cut into specific nucleotide sequences by **restriction enzymes**.
Explanation:
1. **Restriction enzymes**, also known as restriction endonucleases, are enzymes that can recognize specific DNA sequences and cleave the DNA at those sequences.
2. These enzymes are used in molecular biology to cut DNA at specific sites, allowing scientists to manipulate and study DNA sequences.
3. Each restriction enzyme recognizes a specific nucleotide sequence, and when it encounters that sequence in a DNA molecule, it cuts the DNA at that precise location.
4. This ability to cut DNA at specific sequences is essential for techniques such as DNA cloning, gene editing, and genetic engineering.
5. By using different restriction enzymes with distinct recognition sites, researchers can create DNA fragments with precise ends that can be joined together to construct recombinant DNA molecules.
In summary, **restriction enzymes** play a crucial role in molecular biology by allowing precise cutting of DNA at specific nucleotide sequences.
