Case Study: How Do Bacteria Become Resistant?

worksheetStudents analyze data regarding methicillin and penicillin resistant bacteria, focusing how hospitals inadvertently drive the evolution of resistant strains.  Each section of the case explores an aspect of dealing with bacteria, including sanitation,  analyzing agar plates uses the Kirby-Bauer disk method and concludes with students suggesting plans for reducing the incidence of MRSA in hospitals.

Grade Level: 9-12  |  Time:  1 – 1.5 hr

HS-LS4-3 – Apply concepts of statistics and probability to support explanations that organisms with an advantageous heritable trait tend to increase in proportion to organisms lacking this trait.
HS-LS4-4 – Construct an explanation based on evidence for how natural selection leads to adaptation of populations.

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Answer Key


  1. Kari Parnin
  2. Admin
  3. Sarah
  4. Admin
  5. Arturo Julian Tapia
  6. Admin
  7. Katie Kalina
  8. Admin

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