BIO1140 CLASS NOTES - TOPIC 1 & 2

BIO1140 CLASS NOTES - The cell is the basic unit of biology Every organism consists of a cell or is itself a single cell The convergence of

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The cell is the basic unit of biology Every organism consists of a cell or is itself a single cell The convergence of cytology, genetics and biochemistry has made modern cell biology a dynamic discipline The Cell Theory: A Brief History Focus on cell biology began with the use of microscopes on biological material ranging from tree barks to human sperm Robert Hooke used a microscope (30-fold) that he build himself to examine cork (tree bark) Robert Hooke did not observe living cells, but observed empty cell wall of dead plant tissue Factors that limited further understanding of the nature of cells: limited resolution of the microscopes and the essential descriptive nature of the seventeenth-century biology Further development lead to observing structures only 1 micrometer apart (1um) 10 -6 Matthia Schleiden brought forth the conclusion that all plant tissues are composed of cells and that an embryonic plant always rises from a single cell Similar conclusion concerning animal tissue were reported by Theodor Schwann laying the belief that plants and animal cells resemble each other Schwann drew all these observations together into a unified theory the cell theory 1. All organism consists of one or more cells 2. The cell is the basic unit of structure for all organisms Rudolf Virchow concluded that cells arose in only one manner—by the division of other, preexisting cells 3. All cells arise only from preexisting cells Henrietta Lacks who contributed the first human cells (from a malignant tumor) to be artificially cultured giving rise to the very famous line of human culture
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This note was uploaded on 06/17/2008 for the course BIO 1140 taught by Professor Fenwick during the Winter '07 term at University of Ottawa.

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BIO1140 CLASS NOTES - The cell is the basic unit of biology Every organism consists of a cell or is itself a single cell The convergence of

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