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

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EcoR I

Adenosine deaminase

Thermostable DNA polymerase

Hind II

answer is A.

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Detailed Solution

The first discovered restriction endonuclease is Hind II. It was found that Hind II always cut DNA molecules at a particular point by recognising a specific sequence of six base pairs. This specific base sequence is known as the recognition sequence for Hind II.
EcoRI is obtained from Escherichia coli RY 13.
Taq polymerase is a thermostable DNA polymerase used in PCR.
ADA enzyme is crucial for the immune system to function. In SCID, there is deficiency of ADA enzyme.

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