Biology Tuition Singapore A Level H2 H1 Biology Tuition – ISOLATION CLONING SEQUENCING DNA-Preparation of Genomic DNA

Assume that you are trying to insert a gene into a plasmid. Someone gives you a preparation of genomic DNA that has been cut with restriction enzyme X. The gene you wish to insert has sites on both ends for cutting by restriction enzyme Y. You have a plasmid with a single site for Y, but not for X. Your strategy should be

A insert the fragments cut with X directly into the plasmid without cutting the plasmid

B cut the plasmid with restriction enzyme X and insert the fragments cut with Y into the plasmid

C cut the DNA again with restriction enzyme Y and insert these fragments into the plasmid cut with the same enzyme

D cut the plasmid twice with restriction enzyme Y and ligate the two fragments onto the ends of the DNA fragments cut with restriction enzyme X

ANS: C

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