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Q47 A bacterial culture (200 pl containing 1.8 X 109 cells) was treated with an antibiotic Z (50 pgper ml) for 4 h at 3 70 After this treatment, the culture was divided into two equal aliquots.Set A: 100 pl was plated on Luria agar.Set B: 100 pl was centrifuged the cell pellet washed and plated on Luria agar.Aer incubating these two plates for 24 h at 37C= Set A plate showed no colonies, whereas theSet B plate showed 0.9 X 10 cells. This experiment showed that the antibiotic Z is

  1. bacteriostatic
  2. bacteriocidal
  3. bacteriolytic
  4. apoptotic
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