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Which one of the following restriction endonucleases is a blunt cutter?

  • A.BamHI
  • B.EcoRI
  • C.HindIII
  • D.EcoRV

Answer: D

The blunt cutter is EcoRV.

EcoRV recognises GATATC and cuts both strands at the same point, in the middle (GAT|ATC), leaving blunt ends with no single-stranded overhang.

The other three make staggered cuts that leave 5' overhangs (sticky ends): BamHI cuts G|GATCC, EcoRI cuts G|AATTC and HindIII cuts A|AGCTT, each leaving a four-base single-stranded tail that can pair with a matching end.

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