試題詳解

1. Restriction enzymes are invaluable tools in gene cloning because :
(A) they cut both strands of DNA at specific sites
(B)they replicate the gene of interest
(C)they can produce sticky ends so DNA from different sources can be joined together
(D)they cut at specific sites within the DNA and produce sticky ends allowing DNA from different sources to be joined together
(E) they replicate the DNA of interest, they cut at specific sites within the DNA, and produce sticky ends allowing DNA from different sources to be joined together