BIO 1140 Lecture 1: Reading Notes Lectures Weeks 1-5
10 Feb 2018
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Each chromosome contains one very long dna molecule with hundreds of thousands of genes. Nucleotides along a strand of dna are transcribed into rna, which is then translated into proteins. Genomics = an approach of studying whole sets of genes instead of single ones at a time. Light microscope (lm): light passes through the specimen and then through the glass lenses. The lenses bend the light so that the specimen is magnified and projected into the lenses. Electron microscope (em): beam of electrons through the specimen or onto its surface. Scanning electron microscope (sem): electron beam scans the surface of the specimen, which is usually coated with a thin film of gold. Results in an image of the surface of the specimen that looks 3d. Transmission electron microscope (tem): can be used to look at the internal structure of cells. Aims the electron beam through a section of the cell. Disadvantage of electron microscopes: it kills the cells.
