Over the past several decades, natural selection has resulted in populations of
ID: 30981 • Letter: O
Question
Over the past several decades, natural selection has resulted in populations of Staphylococcus aureus (an infectious wound bacterium) evolving resistance to most antibiotics. What would you predict would happen to an antibiotic resistant S. aureus population if antibiotic use was terminated?
Question options:
The growth rate of drug resistant S. aureus in the population will increase.
The cells in the population would lose the mutation that caused antibiotic resistance.
The frequency of resistant S. aureus will decrease in the population.
The mutation rate of drug resistant cells would revert back to the mutation rate of nonresistant cells in the population.
a)The growth rate of drug resistant S. aureus in the population will increase.
b)The cells in the population would lose the mutation that caused antibiotic resistance.
c)The frequency of resistant S. aureus will decrease in the population.
d)The mutation rate of drug resistant cells would revert back to the mutation rate of nonresistant cells in the population.
Explanation / Answer
c)
The frequency of resistant S. aureus will decrease in the population.
the bacteria may not have acquire the antibiotic resistance and the bacteria will die, if antibiotic resistance gene is not present.
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