Penicillin is an antibiotic used to treat infections caused by bacteria.
Which events explain how bacteria become resistant to penicillin?
1. The number of bacteria with the allele for resistance to penicillin increases.
2. Resistance to penicillin is the result of a mutation in a bacterium.
3. Bacteria with the allele for resistance to penicillin pass the allele to their daughter cells.
4. The mutation for resistance to penicillin is always caused by the presence of penicillin.
1 )
1, 2, 3 and 4
1, 2 and 3 only
3 )
1 and 4 only
4 )
2 and 3 only
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