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Cell Biology Levels of Organization chemical basic chemicals proteins 50% lipids 50% cell building block structural components cell membrane (plasmalemma) cytosol (cytoplasmic liquid) organelles (membrane surrounded)  nucleus mitochondria Golgi Apparatus Edoplasmic Reticulum Rhibosomes Lysosomes cytoskeleton peroxisomes inclusion (non membrane surrounded) functional aspects intracellular functions extracellular functions volume of cells in body 2/3 inside 1/3 outside tissue organs systems organism

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