BIO 155 Lecture Notes - Lecture 2: Peptidoglycan, Genetic Variation, Cytoskeleton
3 Oct 2016
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There are over 200 types of cells in the human body. 1665 robert hook coined the term cell because when he looked at the dead tissue specimen he saw lots of small compartments. 1674 antoine van leeuwenhoek was first to observe live bacteria cells in pond water because of a ten-fold increase in amplification (new microscope) 1839 schlieden and schwann proposed the cell theory. Fundamental structural and functional unit of all living organisms. The cell theory = everything alive consists of cells. Magnification-ratio of an image"s size to its real size (how much bigger it appears) Lens refracts light passed through a specimen to result in a magnified image in the eye. Contain cytosol in the area enclosed by plasma membrane. Contain ribosomes (only type of organelle that is not surrounded by a membrane/create protein) Tay sachs: results from defective lysosomes the stomachs of cells. Leads to build up of fat in nerve cells = shut down central nervous system.
