If a bacterium carrying a plasmid that confers resistance to ampicillin is placed into medium without ampicillin, it may
A. gain resistance to other antibiotics.
B. transfer resistance to other cultures in the laboratory.
C. undergo a reversion mutation.
D. lose the plasmid because there is no selection for ampicillin resistance.
Answer:D
If a bacterium carrying a plasmid that confers resistance to ampicillin is placed into medium without ampicillin, it may
A. gain resistance to other antibiotics. B. transfer resistance to other cultures in the laboratory. C. undergo a reversion mutation. D. lose the plasmid because there is no selection for ampicillin resistance.