Biology / Unit 1 Bio 0067 short lesson, about 20 seconds
Prokaryote and Eukaryote
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The idea
A prokaryote is a cell without a membrane-bound nucleus or organelles; a eukaryote is a cell with both.
In practice
A bacterium's DNA floats free in the cell; an animal cell's DNA sits enclosed inside a membrane-bound nucleus.
Where people slip
This course keeps prokaryote and eukaryote as the two locked terms for this split — no third category sits between them.
Your place on the trail
Every lesson rests on earlier ones and opens later ones. Tap any to jump.
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