Which of the following statements are correct? A. Restriction enzymes cut the strand of DNA a li...

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Which of the following statements are correct?
A. Restriction enzymes cut the strand of DNA a little away form the centre of the palindrome sites, but between the same two bases on the opposite strands.
B. Hind II always cuts DNA molecules at a particular point by recognizing a specific sequence of six base pairs.
C. Separated DNA fragments cannot be visualized without staining on an agarose gel electrophoresis.
D. ori is the sequence responsible for controlling the copy number.
E. DNA is positively charged molecule.
(1) A, C and E
(2) A, B, C and D
(3) C, D and E
(4) A, B, C, D and E
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