Commonly confused

Pepsin vs Trypsin

The tell

Pepsin works in the stomach at pH ≈ 2 and is activated by HCl. Trypsin works in the duodenum at pH ≈ 8, is activated by enteropeptidase, and arms all the other pancreatic zymogens.

Pairs like this are where exam points go missing, the concepts are fine, the labels swap. Retrieval fixes it faster than rereading: the daily quiz mixes confusable pairs into every set.

Today’s daily quiz All confusable pairs