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Topic: Centrosome


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  centrosome - Hutchinson encyclopedia article about centrosome   (Site not responding. Last check: 2007-10-21)
During cell division the centrosomes organize the microtubules to form the spindle that divides the chromosomes into daughter cells.
Centrosomes were first described in 1887, independently by German biologist Theodor Boveri (1862–1915) and Belgian biologist Edouard van Beneden.
This information should not be considered complete, up to date, and is not intended to be used in place of a visit, consultation, or advice of a legal, medical, or any other professional.
encyclopedia.farlex.com /centrosome   (90 words)

  
 Meiosis - Wikipedia, the free encyclopedia
The kinetochore functions as a motor, pulling the chromosome along the attached microtubule toward the originating centriole, like a train on a track.
The new equatorial plane is rotated by 90 degrees when compared to meiosis I, perpendicular to the previous plane.
This is followed by anaphase II, where the centromeres are cleaved, allowing the kinetochores to pull the sister chromatids apart.
en.wikipedia.org /wiki/Meiosis   (2426 words)

  
 Mitosis: Facts and details from Encyclopedia Topic   (Site not responding. Last check: 2007-10-21)
The two centrosomes of the cell serve as organizing centers for microtubule[For more, click on this link]s.
(the two centrosomes — which replicate independently of mitosis — begin recruiting microtubules (which may be thought of as cellular ropes or poles) and forming mitotic spindle mitotic spindle quick summary:
The mitotic spindle is a structure of the eukaryotic cytoskeleton involved in mitosis and meiosis....
www.absoluteastronomy.com /encyclopedia/m/mi/mitosis.htm   (2193 words)

  
 CSC - Intelligent Design: The Origin of Biological Information and the Higher Taxonomic Categories
While both the membrane targets and the centrosomes are made of proteins, the location and form of these structures is not wholly determined by the proteins that form them.
Indeed, centrosome structure and membrane patterns as a whole convey three-dimensional structural information that helps determine the structure of the cytoskeleton and the location of its subunits (McNiven & Porter 1992:313-329).
Preexisting three-dimensional form present in the preceding generation (whether inherent in the cell membrane, the centrosomes, the cytoskeleton or other features of the fertilized egg) contributes to the production of form in the next generation.
www.discovery.org /scripts/viewDB/index.php?command=view&id=2177&progr...   (14205 words)

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