Which antibiotics were NOT effective at all against E. coli?

The streptomycin antibiotic is not effective on E. coli I as it is resistant to it, so it continued growing on the agar plate. It was not resistant to ampicillin, so the ampicillin destroyed the bacteria

a- multicellular

b-eukaryotic

c-no cell wall

d-heterotrophic

e-autotrophic

correct answer is a. and d.