Biology 1201A Lecture Notes - Antonie Van Leeuwenhoek, Nuclear Membrane, Rudolf Virchow
22 Nov 2012
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Document Summary
Late 1600"s, anton van leeuwenhoek discovered and described diverse protists, sperm cells, and bacteria (1673) Rudolf virchow proposed that cells arise only from pre-existing cells by a process of division. Cell theory: all organisms are composed of one or more cells, the cell is the basic structural and functional unit of all living organisms, cells arise only from the division of pre-existing cells. 2. 1 basic features of cell structure and function. Cells carry out the essential processes of life. Contain highly organized systems of molecules such as dn and rna. Use chemical molecules or light as energy sources for their activities. Respond to changes in their external environment by alternating their internal reactions. Duplicate and pass on hereditary information as part of cellular reproduction. Unicellular: almost all bacteria and archaea, some protists such as amoebas, and some fungi such as yeast.
