Biology / Unit 1 Bio 0060 short lesson, about 20 seconds
Levels of Organization: Atom to Cell
Captions available
The idea
Living structure builds upward from atoms, through molecules, macromolecules, and organelles, to the cell, the smallest unit that is itself alive.
In practice
Carbon atoms form a DNA molecule; DNA and proteins pack into organelles, which make up one living cell.
Where people slip
A cell is the smallest level here that counts as alive on its own — no organelle survives once removed from it.
Your place on the trail
Every lesson rests on earlier ones and opens later ones. Tap any to jump.
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