Which two enzymes are needed to produce recombinant DNA?
A. Endonuclease, transcriptase
B. DNA polymerase, topoisomerase
C. Polymerase, ligase
D. Restriction enzyme, ligase
E. Transcriptase, ligase
Plasmids were usually isolated from:
A. viruses
B. DNA
C. bacteria.
D. Fungi.
E. human cell
Plasmids are important in biotechnology because they are
A. a vehicle for the insertion of recombinant DNA into bacteria.
B. surfaces for respiratory processes in bacteria.
C. recognition sites on recombinant DNA strands.
D. surfaces for protein synthesis in eukaryotic recombinants.
E. proviruses incorporated into the host DNA
微信支付 
支付宝支付