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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

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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.
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