SHOW LAB WORK QUESTION 14 OF 14 Suppose you are on a remote island known to have
ID: 166097 • Letter: S
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SHOW LAB WORK QUESTION 14 OF 14 Suppose you are on a remote island known to have mice that carry either S. aureus or E. coli. A mouse bites you and you develop an infection. There is no biology lab on the island, but there is a supply of antibiotics. You can only take one antibiotic because taking more than one will make you very sick from the drug interactions. Which antibiotics would be the most effective for fighting the unidentified infection? A. ampic n and erythromycin B. neomycin and penicillin C. penicillin and ampicillin D. penic n and neomycinExplanation / Answer
1. D. penicillin and neomycin. The treatment of choice for S. aureus infection is penicillin. In case of E.coli, the antibiotic neomycin plays an important role by increasing the frequency of translational errors in the bacteria.
2. In case if ethanol is not added in the process of gram staining, both E.coli(gram negative bacteria) and S.aureus(Gram positive bacteria) will appear blue. Since ethanol acts as a decolorizer, its absence would result in non-removal of crystal violet from E.coli.
3. Penicillin is the antibiotic which has the largest diffusion ring into S.aureus growth.
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