Lecture1310fc - Chemistry 83 Life and the Natural Systems...

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Chemistry 83 10/19/10 1 Life and the Natural Systems that Support Life 3. Living organisms tend to have a complex and highly organized internal structure that they are able to maintain 1. Living organisms are capable of obtaining and utilizing matter and energy from their environment 2. Living organisms are capable of growth by using energy and raw materials from the environment to increase in size, and to change as they grow Observations of unique properties of living matter serve as the foundation of biology
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Chemistry 83 10/19/10 2 5. Living organisms are capable of reproduction - producing off-springs that have attributes similar to those of their parents 4. Living organisms sense changes in their surroundings and make controlled responses that keep their internal environment relatively constant (called homeostasis ) ( http://www.biology.iupui.edu/biocourses/ N100/2k4ch1notes.html ) Sources: Bloomfield, M.M., Stephens, L.J., Chemistry and the Living Organism , 6th ed, NY, Wiley, 1996, pp 1-2. Miller, G.T., Jr., Energetics, Kinetics, and Life : An ecological Approach, Belmont, CA, Wadsworth Publishing Company, Inc., 1971, p 237. Pauling, L., College Chemistry , 3rd, Freeman, San Francisco, 1964, p. 722. The three basic components of the original cell theory are: 1. The cell is the basic unit of life in all living things (Schleiden & Schwann)(1838-39) 2. All organisms are composed of one or more cells (Schleiden & Schwann)(1838-39) 3. All cells are produced by the division of preexisting cells. (Virchow)(1858) [ Factoids: cells are very small - it would take as many as 50 cells to cover the area of a dot on the letter “i”. T he average human is composed of around 100 Trillion individual cells!!!] Explanations of observations in biology are based on the Cell Theory www.worldofteaching.com/powerpoints/.../The%20 Cell %20 Theory .ppt
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Chemistry 83 10/19/10 3 http:// www.animalport.com/ animal-cells.html Cells consist of compartments surrounded by fluid Each compartment (organelle) has a specific role in sustaining life. Fluid facilitates transport of matter and energy needed by organelles. (Energy source for cell) Over 200 types of specialized cells are produced from a fertilized egg in a series of cell divisions. Once differentiated, further cell divisions duplicate cells. http://scienceblogs.com/clock/2006/12/from_two_cells_to_many_cell_di.php Cells differentiate by cell division
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Chemistry 83 10/19/10 4 http://www.reiki.nu/treatment/humanbody/organs/organe.gif Tissue - group of specialized cells. Organ - groups of tissues performing a common task. Organ System - groups of organs performing a common task.
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