Paper 1, Oct Nov 2006 | Cambridge AS - A Level Biology (9700) Past Papers

Some common antibiotics are listed. The action of each antibiotic is described.
1 rifampicin – inhibits RNA polymerase
2 streptomycin – inhibits 70S ribosomes
3 neomycin – inhibits DNA synthesis
4 ampicillin – inhibits peptidoglycan synthesis
Which of these antibiotics will affect the activities of bacterial cells only?