If You Examine a Natural Population of Bacteria,it Is Common

question 44

Multiple Choice

If you examine a natural population of bacteria,it is common to find some antibiotic-sensitive and some antibiotic-resistant strains,even if the population has never been exposed to any antibiotic.Which explanation could account for this situation?

• A) The resistant strain developed as a mutation and had no negative effect on fitness.
• B) Selection favored the resistant strain and maintained it in the population so that it would be prepared for future antibiotic exposure.
• C) The resistant strain had greater fitness compared to sensitive strains when the antibiotic was absent.
• D) none of these
• E) all of these

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