The first natural antibiotic, discovered by Alexander Fleming, was:
APepsinogen
BPrednisone
CParacetamol
DPenicillin
Answer & Solution
Correct answer: D. Penicillin
1. A mould contaminated his staphylococcus plates.
2. The substance it made killed the bacteria.
3. That substance was penicillin.
_Source: OpenStax Microbiology, Chapter 14, Antimicrobial Drugs._
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