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Palindrome Sequences

How many frag...

Question

How many fragments will be generated if you digest a linear DNA molecule with a restriction enzyme having four recognition sites on the DNA?

A

3

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B

6

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C

5

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D

4

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Solution

The correct option is C 5
If DNA is linear then the number of fragments generated is (N+I), where N= number of recognition sites or sequences. Hence, the number of fragments generated is 5 if we digest a linear DNA molecule with a restriction enzyme having four recognition sites on the DNA.

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Q. How many of the following statements are correct?
I. If a linear DNA molecule is digested with a restriction enzyme at four recognition sites, 4 fragments would be produced.
II. If a closed circular DNA molecule is digested with a restriction enzyme at six recognition sites, 6 fragments would be produced.
III. If a linear DNA molecule is digested with a restriction enzyme at four recognition sites on the DNA, 5 fragments would be produced.
IV. If a closed circular DNA molecule is digested with a restriction enzyme at six recognition sites, 7 fragments would be produced.

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