Question

First discovered restriction endonuclease that always cuts DNA molecule at a particular point by recognising a specific sequence of six base pairs is

(1) Hind II

(2) EcoR I

(3) Adenosine deaminase

(4) Thermostable DNA polymerase

Answer 1

Answer (1) Hind II

Sol. 

• The first restriction endonuclease is Hind II.
• EcoRI is obtained from Escherichia coli Ry13
• Thermostable DNA polymerase is used in PCR called Taq polymerase
• ADA enzyme is crucial for the immune system to function. In SCID, there is deficiency of ADA enzyme.