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Which option correctly matches a restriction enzyme and recognition sequence?

Answer and explanation

Correct answer: EcoRI-GAATTC

EcoRI is a restriction endonuclease whose well-known recognition sequence is 5′-GAATTC-3′. It cuts within this palindromic site and produces cohesive, or sticky, DNA ends. HaeIII is associated with GGCC, not GAATTC, while BamHI recognizes GGATCC rather than AAGCTT. The sequence AAGCTT is associated with HindIII, so option D is also mismatched. Thus option A is the only correct enzyme–recognition-sequence pairing. Correct matching is important because the choice of restriction enzyme determines where a vector or insert will be cut and whether their ends will be compatible for ligation.

Related tags

EcoriGaattcRecognition SequenceEnzyme MatchingRestriction EnzymesPrinciples Of BiotechnologyBiotechnologyClass 11 Mcq

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