Commonly confused

Substrate-level phosphorylation vs Oxidative phosphorylation

The tell

Substrate-level transfers a phosphate directly from a molecule; it needs no oxygen. Oxidative uses the proton gradient and requires O₂ as final acceptor.

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