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Unformatted text preview: 1-17-08Chapter 4 Cell Structure and Function1.What are cells? - Smallest unit of structure and functiona.Cell Theoryi.All organisms are composed of cellsii.Cells come from pre-existing cellsb.Why are most cells so small?i.Most cells are microscopic but they can range in size from a nerve cell (3-4 ft) to the average cell between 1-100 umii.Nuclear control1.Nucleus can only control to a certain distance2.Cytoplasmic volume must be small enough for nuclear controliii.Surface to volume ration1.As cell size increases the volume increases much faster than the surface area2.Problem: inadequate exchange surface2.Two types of cellsa.Prokaryotesi.before nucleusii.Lack membrane-bound organellesb.Eukaryotesi.true nucleusii.Have membrane-bound organelles3.Cellular Componentsa.Cytoplasmi.Particulate phase organelles, lipids, proteinsii.Cytosol-aqueous phase various dissolved moleculesb.Nucleus information centeri.Nuclear envelope double membrane that contains pores and...
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