Biology / Bio 0060 · Atom · ~20 seconds
Levels of Organization: Atom to Cell
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Living structure builds upward from atoms, through molecules, macromolecules, and organelles, to the cell, the smallest unit that is itself alive.
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Carbon atoms form a DNA molecule; DNA and proteins pack into organelles, which make up one living cell.
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A cell is the smallest level here that counts as alive on its own — no organelle survives once removed from it.