BLG 143 Final: BLG143 Chapter1 Exam Notes

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31 Jan 2015
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Chapter 1: biology and the tree of life. Organism: living entity made up of one or more cells. 5 fundamental characteristics: energy: used to stay alive and reproduce, cells: made up of cells (membranes regulate passage or material in and out, information: process genetic and environmental information, replication: divide in 2, evolution: product of evolution. The cell theory: all organisms are made of cells and all cells come from pre-existing cells. Robert hooke: used crude microscope to examine cork (x30) and observed cells. Anton van leeuwenhoek: developed more powerful microscope (x300) and observed blood and sperm cells. Cell: highly organized compartment bounded by plasma membrane that contains concentrated chemicals in aqueous solution. Chemical runs occur inside that sustain life. Spontaneous generation hypothesis: cells arise spontaneously from nonliving material (wrong) All-cells-from-cells hypothesis: cells are produced only when pre-existing cells grow and divide (right)

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