09-27-06 (10) Cell Intro

09-27-06 (10) Cell Intro - Introduction to Cells Cells The...

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Introduction to Cells September 27, 2006
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Cells The cell is the fundamental unit of life (it’s the smallest unit that can be alive and can carry out the processes of life) The single cell is the vehicle for the hereditary information that defines the species All organisms are created by cell division from a single cell
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Cells Most living organisms are single cells Other organisms are multicellular All organisms are created by cell division from a single cell
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Cell Theory (Schliden and Schwann) All living things are made up of cells The cell is the structural and functional unit of all living things All cells come from pre-existing cells “Omnis cellula e cellula” - R. Virchow
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All Cells Bounded by a membrane Contain cytosol within the membrane Store their hereditary information in DNA Ribosomes
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Cell Diversity Despite the similarities, there are many differences Different mechanisms for obtaining energy Different mechanisms for obtaining carbon Different relationship to oxygen
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Obtaining Energy Phototrophic -Obtaining energy from light Chemotrophic -Obtain energy from chemicals
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