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Transcript
Centrioles and Centrosomes Chandler Kolb Honors Biology Green 2 Edouard Van Beneden & Theodor Boveri • 1876-1888 • Edouard van Beneden discovered the centriole • –experimented with chromosomes • Theodor Boveri named the region centrosome (especial organ of cell division) - experimented with fertilization of a zygote Structure • Centrosome- “Microtubule Organizing Center” • Centriole- small organelle that has three sets of nine fused microtubules • Microtubules- tubular cytoplasmic filament composed of protein tubulin Location Function • Cell division (Centrosomes) • Mitosis- produces two daughter cells identical to the parent cell • cilia and flagella (centrioles) • the position if the centrioles determines the position of the nucleus a crucial role in the spatial arrangement of cell organelles Mitosis • Four phases: Prophase, Metaphase, Anaphase, and Telophase • Create a Spindle Apparatus • http://faculty.clintoncc.suny.edu/faculty/michael.gregory/files/bio%20101/Bio%201 01%20Lectures/Mitosis/mitosis.htm • ..\..\Pictures\Cell Organelle Projects\Mitosis.exe Animal or Plant Cell? • Centrosomes are found in both • Centrioles are only in animal cells • Plants still perform • Why? Cilia and flagella for cells are surface features used for cell movement, cells in plants aren’t required to move around like those in animal cells Efficiency • Centrosomes aren't necessary for cell division, however they greatly increase the efficiency • Think about how many cells reproduce daily… • An inability of cells to use centrioles to make functional cilia and flagella a number of genetic and developmental diseases Works Cited • http://users.rcn.com/jkimball.ma.ultranet/BiologyPages/C/Cytoskeleton.html#microtubules -7 November 2009 • http://www.ncbi.nlm.nih.gov/pmc/articles/PMC2634415/ -2008 • http://www.biology.arizona.edu/cell_bio/tutorials/cell_cycle/cells3.html -October 2004 • http://faculty.clintoncc.suny.edu/faculty/michael.gregory/files/bio%20101/Bio%20101%20Lectures/Mitosis/mitosi s.htm -2009 • http://www.absoluteastronomy.com/topics/Centrosome -2009 • http://en.wikipedia.org/wiki/Centrosome -17 November 2009 • http://www.newworldencyclopedia.org/entry/Centriole - 22 July 2008 • http://8e.devbio.com/article.php?ch=7&id=75 • http://www.cod.edu/people/faculty/fancher/CellStructure.htm -Sept 2004 • http://en.wikipedia.org/wiki/Centrosome - 17 November 2009