How do restriction enzymes assist in genetic research?

• A. By inducing mutations randomly
• B. By cutting DNA at specific sequences
• C. By amplifying DNA sequences
• D. By repairing DNA damage

Answer: (B)

Restriction enzymes are crucial tools in genetic research because they have the unique ability to cut DNA at specific sequences, known as recognition sites. This precision allows scientists to manipulate DNA with great accuracy. By cleaving DNA at these predetermined sites, researchers can create fragments of DNA that can be further analyzed, inserted into vectors for cloning, or used in various genetic engineering techniques.

When the DNA is cut, it can generate either blunt ends or sticky ends, which can then be ligated with other DNA fragments, allowing for the construction of recombinant DNA molecules. This capability is fundamental in applications such as cloning, gene therapy, and genetic mapping, facilitating the exploration and modification of genetic material in various organisms. Thus, the specific sequence-targeting ability of restriction enzymes makes option B the correct answer.