Mondo Knows Facts
Cell theory began with a piece of cork
Robert Hooke saw tiny empty compartments in cork and called them cells Looking at a thin slice of cork in 1665, Hooke observed boxlike spaces that reminded him of monastery rooms. He had actually seen dead cell walls, not living tissue. Two centuries later Schleiden and Schwann argued that all living things are made of cells. It sits in Mondo's science collection, one of 200 facts that each trace back to the reference below.
Where this comes from
Facts that can change over time are reviewed and updated. If something here looks wrong, Mondo would rather know than be confidently incorrect.
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Mitochondria produce most of the energy used by eukaryotic cellsCellular respiration inside mitochondria converts nutrients into energy-rich ATP moleculesApoptosis is an orderly process of programmed cell suicideCells activate internal self-destruction pathways to eliminate damaged or unwanted tissueChloroplasts and mitochondria originated as engulfed bacteriaEndosymbiotic events turned ancient single-celled microbes into vital plant and animal organellesA double layer of lipids forms cell membranesWater loving heads face outward while oily tails hide insideCell size is limited by diffusionAs a cell grows, its volume outpaces the surface area it needs for suppliesMature red blood cells have no nucleusMammalian red cells eject it to make room for more oxygen carrying protein
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Tags: biology, cells, history
Cell theory began with a piece of cork: the short answers
- Where does this come from, and can I check it?
- Robert Hooke saw tiny empty compartments in cork and called them cells. The figure is taken from Royal Society, which is linked in full on this page. Every fact on Mondo Knows names its source rather than repeating an unsourced claim.
- Is this really a science fact?
- Yes. It sits on the Science shelf, one of 2,600 sourced facts grouped into space, animals, the human body, history, science and more. Category pages collect every fact in the same field.
- What else can I read about it?
- The links under the fact point to a quiz, game, puzzle or calculator on the same subject, and the shelf below shows related facts. The wording here is original, and quoted phrases are marked as quotations.