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Q.

If a restriction enzyme can recognize the sequence GAATTC, to form blunt ends between which nitrogen bases it has to cut the DNA strands?

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a

G and A

b

A and A

c

A and T 

d

T and T

answer is C.

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Detailed Solution

A restriction enzyme cuts the DNA strand between a particular nitrogen bases of the sequence in both the strands. If it has to form blunt ends, then if it cuts the DNA between G and A one strand, in the opposite strand it has to cut between T and C which it cannot. If it cuts the DNA strand between A and T it can also cut the other DNA strand between A and T to make straight cuts and form blunt ends in the DNA fragments.

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