Question

the specific sequence of dna recognized by restriction endonuclease are

Answer 1

Restriction endonucleases are enzymes that recognize a specific DNA sequence, called a restriction site, and cleave the DNA within or adjacent to that site. For example, the restriction endonuclease EcoR I, isolated from the bacterium Escherichia coli, recognizes the following sequence:

It cleaves the DNA between the G and A on each strand, producing 5′ overhangs of four nucleotides, as shown here:

The termini produced by EcoR I, since they are complementary at their single-stranded overhangs, are said to be cohesive or sticky.