The antibiotic resistance gene carried on a plasmid vector serves to
- A. cut the DNA at specific points
- B. digest the bacterial cell wall
- C. colour the bacterial colonies
- D. identify the bacteria that have successfully taken up the plasmid
Explanation
Only bacteria carrying the plasmid survive on antibiotic containing medium, so the marker selects the transformed cells. The cutting is done by the restriction enzyme before the plasmid enters the cell.
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