Commonly confused

Pyruvate carboxylase vs PEP carboxykinase

The tell

Carboxylase adds CO₂ to pyruvate in the mitochondrion. Carboxykinase removes it from OAA in the cytosol.

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