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Question

The specific DNA sequence where Eco RI cuts is
  1. GATTCG
  2. GAATTC
  3. GTTCAA
  4. TTCCAA


Solution

The correct option is B GAATTC
Eco RI found in E.coli recognizes this base sequences GAATTC in DNA duplex and cuts its strand between G & A.  Since G and A are on the extreme ends of the 6 nucleotide sequence, the enzyme creates a sticky end.

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