An intersting property of restriction enzymes is molecular cutting and past-ing. Restriction enzymes typically recognize a symmetrical sequence of DNA .

Notice that the top strand is the same as the bottom strand, but reads backward . When the enzyme cuts the strand between G and A, it leaves over-hanging chains

a. What is this symmetrical sequence of DNA known as ?
b. What is the significance of these overhanging chains ?
c. Name the restriction enzyme that cuts the strand between G and A.

Explanation

a. This symmetrical sequence of DNA is known as .palindromic se-quence .
b. These overhanging chains have sticky ends and they can be easily joined by DNA ligase.
c. Restriction endonuclease from E.coli strain (Eco RI)