AP BIOLOGY

Detailed explanation-1: -A restriction enzyme is a protein isolated from bacteria that cleaves DNA sequences at sequence-specific sites, producing DNA fragments with a known sequence at each end.

Detailed explanation-2: -Restriction enzymes cleave DNA at specific nucleotide sequences. Restriction endonucleases cleave double-stranded DNA. These enzymes are sequence specific, and each enzyme acts at a limited number of sites in DNA called recognition, or cutting, sites.

Detailed explanation-3: -restriction enzyme, also called restriction endonuclease, a protein produced by bacteria that cleaves DNA at specific sites along the molecule.

Detailed explanation-4: -In general, restriction enzymes cleave double-stranded DNA. Each restriction enzyme recognizes specific DNA sequences, and cleavage can occur within the recognition sequence or some distance away, depending on the enzyme.

Detailed explanation-5: -Abstract. Restriction endonucleases naturally target DNA duplexes. Systematic screening has identified a small minority of these enzymes that can also cleave RNA/DNA heteroduplexes and that may therefore be useful as tools for RNA biochemistry.