mdcat logical reasoning MCQ #501

A population of bacteria develops resistance after antibiotic treatment. What selective pressure caused this?

mdcat logical reasoning MCQ #501

  1. Question 1

    Q1. A population of bacteria develops resistance after antibiotic treatment. What selective pressure caused this?

    • A) Elimination of susceptible strains
    • B) Increased mutation rates
    • C) Horizontal gene transfer
    • D) Reduced environmental resistance

    Answer: Elimination of susceptible strains

    Explanation: Antibiotics act as selection agents for resistant alleles. USAT, HAT and MDCAT analytical sections repeat this pattern.