CellArchitecture

CellArchitecture - Cell Architecture “Five kingdom...

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Unformatted text preview: Cell Architecture “Five kingdom system:” Divide all organisms into groups (kingdoms)-- different groups have different combinations of cell parts (organelles ) ! Procaryota ! Animalia ! Plantae ! Fungi ! Protista Classification of organisms Classification by molecular biology Modern systems divide organisms into groups-- (domains, kingdoms)—on the basis of DNA sequences Prokaryotes ! Bacteria, Archaea ! Simplest structure (Protobionts: a step toward living cells?) Plasma Membrane Thin sheet 7-9 nm (0.007-0.009 ! m) thick Composition: lipid (fat) and protein Found in all cells Functions: ! serves as platform for biochemical reactions ! recognizes outside stimuli ! controls transport of molecules (and larger things) into and out of cell. Cell Wall Thick net (variable width) surrounding the plasma membrane; rigid Found in most prokaryotes (bacteria, archaea); also plants, fungi, some protists Composition: peptidoglycan, cellulose, chitin, etc. (long molecules, porous net) Functions ! limits the size of cell ! controls cell growth Nucleoid Nucleic acid (long, stringy molecule) in center of cell Function: contains information (DNA) ! cell functions (metabolism) ! growth of cell ! reproduction Ribosomes Small, solid spheroids (0.02 ! m diameter) Nucleic acid (RNA) and protein, two subunits each Ave. 30,000 per cell Function ! synthesis of proteins Eukaryotes ! Plants, Animals, Fungi, Protists ! Complex cell structures ! Multicellular organisms, with specialized cells Organelles in prokaryotes that are the "same" in eukaryotes Plasma membrane Cell wall (in plants, fungi, some protists) Ribosomes Nucleus (nuclei)...
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This note was uploaded on 06/18/2010 for the course BIS 103 taught by Professor Abel during the Spring '08 term at UC Davis.

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CellArchitecture - Cell Architecture “Five kingdom...

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