UT Knoxville BIOL 140 - Chapter 7 (87 pages)

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Chapter 7



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Chapter 7

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Pages:
87
School:
University of Tennessee
Course:
Biol 140 - Organization/Function of Cell
Organization/Function of Cell Documents

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Chapter 7 Inside the Cell 2011 Pearson Education Inc Key Concepts The structure and function of a cell s overall shape and composition as well as individual cell components are closely related Molecular zip codes aid material transport within a cell The cell s cytoskeleton provides a structural framework within the cell and plays a role in cell division movement and transport 2011 Pearson Education Inc Key Concepts Cells are highly dynamic and integrated within a cell thousands of chemical reactions occur every second molecules are constantly moving across the plasma membrane cell products are transported along protein fibers and elements of the cell s internal skeleton grow and shrink 2011 Pearson Education Inc Grouping Cells According to morphology there are two broad groupings of life 1 Prokaryotes which lack a membrane bound nucleus 2 Eukaryotes which have such a nucleus According to phylogeny or evolutionary history there are three domains 1 Bacteria prokaryotic 2 Archaea 3 Eukarya eukaryotic 2011 Pearson Education Inc Prokaryotic Cells Structural Overview All prokaryotes lack a membrane bound nucleus Recent advances in microscopy reveal complexity in prokaryotic structure Archaeal cell structure is relatively poorly understood Bacterial cells vary greatly in size and shape but most bacteria contain several structural similarities Plasma membrane A single chromosome Ribosomes which synthesize proteins Stiff cell wall 2011 Pearson Education Inc 2011 Pearson Education Inc Prokaryotic Cells Genetic Information Most prokaryotic species have one supercoiled circular chromosome found in the nucleoid region of the cell The chromosome contains a long strand of DNA and a few supportive proteins In addition to the large chromosome many bacteria contain plasmids Small supercoiled circular DNA molecules Plasmids usually contain genes that help the cell adapt to unusual environmental conditions 2011 Pearson Education Inc 2011 Pearson Education Inc Plasmids file Users



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