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🦠 How do antibiotics stop working?

Targets, selection, gene transfer, and molecular tactics — why resistance is evolutionary pharmacology.

5
lessons
~20 min
to learn
🔬 Science
subject
Adults
level
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What you’ll learn

  1. What antibiotics are aiming atExplain antibiotic targets, spectrum, static/cidal labels, and the need for drug exposure.Antibiotics disrupt bacterial processes that differ from human cells. Spectrum and pharmacokinetics decide who is hit and how hard.
  2. Selection: survival under drug pressureShow antibiotics as selective agents that enrich resistant genotypes.Resistant variants rise when drugs suppress competitors. Fitness costs, compensation, and partial exposures shape outcomes.
  3. How resistance genes appear and moveDistinguish mutation, HGT, mobile elements, and persistence/tolerance.Resistance evolves by mutation and spreads on mobile DNA. Persistence is another survival mode that can aid populations.
  4. Molecular resistance tacticsDescribe enzymatic inactivation, efflux, target change, and biofilm protection.Bacteria destroy drugs, pump them out, rewire targets, and shelter in biofilms — combinable defenses.
  5. Why resistance becomes a shared problemConnect mobility, One Health ecology, stewardship logic, and non-advice boundary.Genes and strains move through linked human–animal–environment systems. This is evolutionary pharmacology — not personal prescribing advice.

Questions this course answers

Why can some antibiotics harm bacteria more than human cells?

Selective toxicity often comes from hitting structures or pathways bacteria need that human cells lack or build differently (e.g., peptidoglycan walls, bacterial ribosomes).

Match each idea

Targets define mechanism; spectrum defines which organisms are typically vulnerable; exposure decides whether the target is actually hit hard enough.

Order the selection story under antibiotic pressure

Selection changes frequencies when a pressure kills or slows some genotypes more than others; survivors can spread.

What does “fitness cost” of resistance often mean?

Altered targets or costly enzymes can reduce competitive growth without drug; compensatory evolution may later reduce that cost.

Fill the term for gene sharing between contemporaries

Horizontal (lateral) gene transfer moves DNA between organisms outside parent-to-offspring inheritance alone.

In your own words, how can a resistance gene jump from one bacterial species to another?

Plasmids, phages, and free DNA can carry resistance genes into new hosts; if expressed, those hosts gain the phenotype under selection.

Grounded in trusted sources

  • CDC Antibiotic Resistance Threats reports and educational materials on how resistance spreads
  • WHO antimicrobial resistance fact sheets and stewardship education pages
  • OpenStax Microbiology — antimicrobial drugs and resistance mechanisms chapters
  • NIH / NIAID educational overviews of antimicrobial resistance research

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