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go in deeper: how many parts? look at freeze etch electron micrographs! organelles, shot through with internal fibers, membranes, tracks along which proteins can move things along. sensors on the outside. mitochondria protein factories. 1000 different enzymes. it's chemistry! YIKES. how much?
this is a whole course, how much to teach?
show Biovisions "inner life of cell" animation of cell. are there any more? will need computer and way to get it onto big screen, unless only 6 or 7 kids, computer screen is fine.