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Centrioles and Centrosomes

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Sarah Buck

on 20 November 2012

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Transcript of Centrioles and Centrosomes

photo credit Nasa / Goddard Space Flight Center / Reto Stöckli Centrioles and Centrosomes CENTROSOME - An area of cytoplasm beside the nucleus containing a pair of centrioles. It is also know as the microtubule organizer.

CENTRIOLE - Cylindrical structures that are made up of nine triplet microtubules and form the asters (star shaped clusters) during mitosis. Centrioles Plays a crucial role in the division of the cell.

During cell division the centrosome divides creating two new centrosomes with pairs of centrioles on either side of the nucleus. Electron Micrograph Images How do centrioles and
centrosomes affect the cell? The centrioles form a spindle for chromosomes next to the nucleus. The position of the nucleus at the time of mitosis is crucial for the division to occur without mutations.

The nucleus has the DNA required to duplicate new cells. These new cells will take some of the existing cells cytoplasm. The process will also require energy to begin the function. References Jansma. R. 2004. Cosmic Mind in the Microcosm. [Image Online] Available at:<http://www.theosociety.org/pasadena/sunrise/53-03-4/sc-jans4.htm> [Accessed on 19 November 2012] Anon., 2009. Mitosis animation. [Video Online] Available at:<http://www.youtube.com/watch?v=CdWn_qRToyw> [Accessed on 17 November 2012] Centrosomes Are tiny, cylindrical organelles near the nucleus which occur in pairs.

Organizes microtubules in the cytoplasm.

Assists spindle fibre development in cell division. Ohio state university. 2012. Centrioles and centrosomes. [Image Online]Available at:<http://www.biosci.ohio-state.edu/~hafisk/thecentrosome.htm> [Accessed on 19 November 2012] Plant cells like animal cells have centrosomes. However, unlike centrosomes in animal cells, they do not have centrioles. Plant cells can divide when the centrosomes are destroyed. Albrecht-Buehler. G., 2010. Cell Intelligence. [Image online] Available at:<http://www.basic.northwestern.edu/g-buehler/htmltxt.htm> [Accessed on 19 November 2012] What is Mitosis? Is the process of cell division where the cell duplicates its DNA and creates two new separate cells.

This occurs in all animal cells. It can also occur in plants and fungi but it is uncommon. Harvard University. 2011. The inner life of a cell. [Video Online] Avaliable at:<http://www.youtube.com/watch?v=uwnw4vg9I5Q> [Accessed on 19 November 2012]
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