MDCAT Biology MCQ #3607

In a species of bacteria, antibiotic resistance emerges due to a genetic mutation. What is the primary mechanism by which this trait spreads?

MDCAT Biology MCQ #3607

  1. Question 1

    Q1. In a species of bacteria, antibiotic resistance emerges due to a genetic mutation. What is the primary mechanism by which this trait spreads?

    • A) Horizontal gene transfer
    • B) Vertical gene transfer
    • C) Gene duplication
    • D) Natural selection

    Answer: Horizontal gene transfer

    Explanation: Antibiotic resistance spreads mainly through horizontal gene transfer, not vertical.