BIOL 141 Lecture Notes - Lecture 1: Cell Theory, Cell Nucleus
27 Sep 2015
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Biol 141 - lecture 1 - what is life? (part 1: syllabus review) (part 2: lecture) Five fundamental characteristics that serve to define a living form or organism: Energy: acquiring and using energy to maintain life and reproduce. Cells: cells are highly organized membrane-bound units that make up organisms. Evolution: organisms are a product of evolution, which populations evolve in order to ensure the survival of its species. Replication: an effect to reproduce (for eukaryotes) or replicate itself (prokaryotes) Information: process hereditary, or genetic information encoded from genes. Information can also be a form of response to the surrounding environment and thus maintain internal conditions. Cell theory, central dogma, and structure/function in biology. Cell theory: states all organisms are made of cells, and all cells come from preexisting cells. Experimentation: pasteur"s experiment using straight-necked flasks and swan- necked flasks showed how a spontaneous generation hypothesis is flawed and cells can only be produced in the presence of preexisting ones.
