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World 4 · Lock and Key: Receptors · 12 min · PRO

Tight grip, wrong target

Affinity and selectivity

PRO · Medicine Lab

World 4: Lock and Key: Receptors is part of PRO

The first world of Medicine Lab is free. PRO opens the other 24 lessons in 6 worlds — simulations, quizzes and all.

  • Molecules that fit
  • Switching the response on, off, half
  • Enzymes, channels and pumps
  • Different kinds of germs
  • Hitting the germ, not you
PRO includes
  • All 60 labs — every world, every lesson
  • Practice exams and certificates

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