BIO130H1 Lecture Notes - Lecture 1: Endoplasmic Reticulum, Multicellular Organism, Nucleoid
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BIO130H1 Full Course Notes
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Bio130 lecture 1: introduction to cells, diversity, and nucleic acids. Unicellular organism -multicellular organism -lake sediment, several prokaryotes. Multicellular organisms have to give up ability to divide and propagate forever. Three tenets of cell theory: all organisms are comprised of one or more cells, the cell is the basic organizational unit of life, cells arise from pre-existing cells. Two main types of cells: prokaryotic cells. Eubacteria (true bacteria) and archaea: eukaryotic cells. Dna present in nucleoid, compacted within certain space within prokaryotic cell. Plasma membrane: selective filter between what"s inside and outside the cell. Stylized bacterium: has a flagellum (not all bacteria have) Volume is 1000x that of a prokaryotic cell. Rudimentary cytoskeleton exists in prokaryotes (nowhere near same level) Required for structure and moving things around the cell (transport from one part of cell to another) Ribosomes: some are attached to endoplasmic reticulum, some floating loose in cytoplasm. Differences between plant and animal cells: plant cell has cell wall.