Restriction Enzymes are Useful in Creating Recombinant DNA Molecules Because

Question

Restriction enzymes are useful in creating recombinant DNA molecules because they
A) generate "sticky ends" by cutting at the same sequence on both strands.
B) are found only in human cells, where they naturally mend broken DNA strands.
C) are only attracted to and act on DNA sequences from different species.
D) are used to encapsulate and transport foreign DNA into cells of the target organism.
E) stimulate DNA amplification so that the desired cells or their products can be scaled up.

Accepted Answer

Restriction enzymes cut double-stranded DNA at specific recognition sites, which often result in overhanging "sticky ends". These sticky ends base pair with complementary sticky ends generated by the same restriction enzyme on other DNA fragments, allowing fragments from different sources to be easily joined. This property makes restriction enzymes useful in creating recombinant DNA molecules. The other choices are incorrect.