A)exonucleases.
B)proteases.
C)restriction enzymes.
D)RNA polymerase.

A)may be a plasmid or bacteriophage.
B)has a restriction enzyme recognition site.
C)contains an origin of replication.
D)contains a selectable marker.
E)All of the choices are correct.

A)produces sticky ends.
B)produces blunt ends.
C)cuts both strands of the DNA molecule.
D)generates restriction fragments.
E)All of the choices are correct.