Question

Which of the following statements are correct?
(i) Restriction enzymes cut the strand of $DNA$ a little away from the centre of the palindrome site, but between the same two bases on the opposite strands.
(ii) Hind II always cuts $DNA$ molecules at a particular point by recognising a specific sequence of six base pairs.
(iii) Separated $DNA$ fragments cannot be visualised without staining on an agarose gel electrophoresis.
(iv) ${}^{\prime }Or{i}^{\prime }$ is the sequence responsible for controlling the copy number.
(v) $DNA$ is a positively charged molecule.

• A. (i), (iii) and (v)
• B. (i), (ii), (iii) and (iv)
• C. (iii), (iv) and (v)
• D. (i), (ii), (iii), (iv) and (v)

Answer 1

Answer: (B)

$DNA$ is a negatively charged molecule.