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Transcript
Cellular Organization and Cell Theory Notes Cell is a membrane-covered structure that contains all the necessary material for life. Unicellular – organisms that are composed of only one cell Multi-cellular – organisms that are composed of more than one cell A) Cellular Organization complex Organism Composed of 2 or more organ systems Organ System Composed of 2 or more organs Organ Composed of 2 or more tissue Tissue Composed of 2 or more cells simple Cell Basic unit of life B) History of the Cell Rudolf Virchow says Matthius Schleiden says Anton Van Leeuwenhoek all living things come that the cell is the basic looked at pond water to from other living cells unit of structure in see the first living cells. plants 1 1 1 1 1 6 6 8 1 8 8 6 7 3 8 3 3 5 5 1 5 8 9 8 Robert Hooke Robert Brown discovers discovers dead the nucleus of the cell Cork cells Theodor Schwann says that the cell is the basic unit of structure in animals C) Cell Theory These work and discoveries of these Scientist helped develop the Cell Theory. The invention and improvement of the microscope was directly involved with coming up with the theory The Cell Theory states: 1) All organisms are composed of one or more cells 2) The cell is the basic unit of life in all living things 3) All cells come from existing cells Exceptions to the Cell Theory – Where did the first cell come from? – Viruses (can’t reproduce by themselves)