Restriction enzymes, also known as restriction endonucleases, are a class of enzymes that recognize specific DNA sequences and cut the DNA at or near the recognition site. These enzymes are produced by bacteria and are used as a defense mechanism against foreign DNA, such as that of viruses. Restriction enzymes play a significant role in genetic engineering as they are used to cut DNA at specific sites to create recombinant DNA molecules. There are hundreds of different restriction enzymes, each with a specific recognition site. The discovery and use of restriction enzymes have revolutionized the field of molecular biology and have allowed for the manipulation of DNA on a molecular level.
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