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2. Here are some DNA fragments that have been isolated by gel electrophoresis after being cut with restriction enzynes. A. 5 -ACTGACATAGGCACCCCTTAA-3 3-TGACTGTATCCGTGGGG-5 5 -TGACTGTATCCGTGGGG-3 3 -ACTGACATAGGCACCCCTTAA-5 5 -GGCATACTAGATCCACGTTAA-3 3-CCGTATGATCTAGGTGC-5 5 -GGCATACTAGATCCACGAATT-3 3-CCGTATGATCTAGGTGC-5 E. 5 -GGCATACTAGATCCACGGATC-3 3-CCGTATGATCTAGGTGC-5 a. Which pair of these fragments has appropriate complementary sticky ends to get joined together in a recombinant DNA molecule? b. What enzyme would we use to join up the DNA backbones to make the make the recombinant molecule?

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Answer #1

sticky or cohesive end has protruding single-stranded strands with unpaired nucleotides called overhangs; each overhang can anneal with another complementary one to form base pairs. The two complementary cohesive ends of DNA can annealtogether via hydrogen bonding.

B and D pair of these fragment make complementay strand.

Answer DNA ligase used to join DNA backbone to make up recombinant molecule.

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