Commonly confused

Photosystem II vs Photosystem I

The tell

PSII comes first and splits water at 680 nm (the 2s go together). PSI runs at 700 nm and makes NADPH.

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