BIOB10H3 Lecture 1: What Is A Cell?
5 Oct 2016
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Smallest unit of life: provides structure for the body, take in nutrients from food and convert them into energy, reproduce, and carry out specialized functions. Robert hooke (1665): examined cork ( made up of cells ) under microscope. Anton van leeuwenhoek (1674): examined pond water ( animalcules) under microscope. Similarities between eu- and prokaryotes: genetic code is identical (information encoded in dna), shared metabolic pathways (synthesis of atp photosynthesis), cell membrane. Endosymbiont theory: endosymbiont = a combination of 2 cells living together in a symbiotic relationship; 1 cell lives inside the other cell. Angstrom (a = mm), nanometer (nm = mm), micrometer/micron (um=mm) Cells grown outside of body in vitro simplified, controlled environment (in plastic flasks filled with defined media) Primary culture: obtained directly from organism (mostly embryonic tissues easy to enzyme digest, divide 50-100 times a day) downside = finite culture.
