09-27-06 (10) Cell Intro

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

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Unformatted text preview: Introduction to Cells September 27, 2006 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 Cells • Most living organisms are single cells • Other organisms are multicellular • All organisms are created by cell division from a single cell 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 All Cells • Bounded by a membrane • Contain cytosol within the membrane • Store their hereditary information in DNA • Ribosomes Cell Diversity • Despite the similarities, there are many differences • Different mechanisms for obtaining energy • Different mechanisms for obtaining carbon • Different relationship to oxygen Obtaining Energy • Phototrophic-Obtaining energy from light • Chemotrophic-Obtain energy from chemicals Obtaining Carbon...
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09-27-06 (10) Cell Intro - Introduction to Cells Cells •...

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