Hind II is a restriction endonuclease which always cut DNA molecule at a particular point by recognizing:
Answer & explanation
Correct answer: option 3
The correct answer is Option (3) → Specific sequence of six base pairs
A restriction endonuclease cuts DNA only at a recognition sequence, a short, specific order of base pairs.
Option (1) Specific promoter region of ten base pairs — Incorrect. A promoter is the site where RNA polymerase binds to start transcription. It is part of a transcription unit, not the site that a restriction enzyme reads.
Option (2) Specific sequence of four base pairs — Incorrect. The recognition sequence of Hind II is longer than four base pairs.
Option (3) Specific sequence of six base pairs — Correct. Hind II reads a sequence of six base pairs and cuts the DNA at a fixed point within it.
Option (4) Specific sequence of eight base pairs — Incorrect. The recognition sequence of Hind II is shorter than eight base pairs.
NCERT Extract:
Restriction Enzymes –
