BIOL120 Lecture Notes - Lecture 12: Symplast, Organic Compound, Cisterna

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All living organisms are made up of one or more cells. Cells are typically 1-300 m in diameter (1 m is equal to 1/1000 of a mm) Hooke used the term cell because the tiny compartments making up the slice of bark reminded him of a monk"s cell. Cell comes from the latin, cella, meaning small room . Characteristics of cells define the three domains of life. Cells are the basic structural and functional units of life. Comparison of selected characteristics of prokaryotic and eukaryotic cells. Prokaryotic cells: 1-10 m, no nucleus, circular genomic dna, no organelles. Eukaryotic cells: 5-100 m, nucleus, linear genomic dna in chromosomes, has organelles: the presence of a membrane bound nucleus distinguishes prokaryotes from eukaryotes. Cell size is limited by a need to maintain a surface area that will allow for exchange of oxygen, water and nutrients for a given volume. Volume grows faster than surface area but the surface area supplies to volume.

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