Lecture 3 - BIOL104-04 Principles of Biology I Lecture#3...

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BIOL104-04 Principles of Biology I Lecture #3 August 27, 2010
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Unifying Themes in Biology Cell Theory Molecular basis of inheritance Relationship between structure & function Diversity of life arises by evolutionary change Evolutionary conservation Cells are information processing systems Living systems exist in a nonequilibrium state
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What is a Cell? A highly organized living entity – Plasma membrane – Contains concentrated chemicals in a aqueous solution
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The Cell Theory All organisms are made of cells Cells are the smallest living things All cells come from preexisting cells.
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The Cell Theory All organisms are made of cells All cells come from preexisting cells. Implications of the cell theory All life on earth represents a continuous line of descent from the earliest cells All single-celled organisms in a population are related to one another All cells in a multi-cellular organism are descended from the same fertilized egg
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