Discussion of all aspects of cellular structure, physiology and communication.

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Post by MIA6 » Sat Nov 11, 2006 8:39 pm

1. Centrioles are normally present in the: (1) cytoplasm of onion cells (2) cytoplasm of cheek cells (3) nuclei of liver cells (4) nuclei of bean cells.
I think the answer should be (2), since the definition of 'centrioles' is most animal cells have tiny structures in the cytoplasm called centrioles. but my teacher told us the answer was (3), i don't understand.
2. Centrioles are cell structures involved primarily in cell division. What does 'cell division' here mean?

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Post by Methal » Sun Nov 12, 2006 1:37 am

During cell division Centrioles are the things that create the "strings" that pull the sister chromatids apart.

in more detail:
they have their function in the formation of the spindle thingers ("strings") during cell division, and consist of a cylinder with nine microtubules that are used to "pull" the sister chromatids apart during metaphase/anaphase of the cell cycle.

The question posed by your teacher sucks.
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Post by SU_reptile » Sun Nov 12, 2006 7:30 am

but my teacher told us the answer was (3), i don't understand

Did your techer explain choosing 3rd answer as a correct one?

Maybe he was thinking about 2nd but told you it's the 3rd one. You should try asking her/him about it.

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Post by kjle » Sun Nov 12, 2006 9:01 am

hmm, I don't think so. Because centrioles don't exist in the cytoplasm, am I right? And the answer is 3 because bean cells don't undergo cell division
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Post by MrMistery » Sun Nov 12, 2006 3:38 pm

neah, SU_reptile is right. Centrioles are part of the centrosome in animal cells. the centrosome is located in the cytoplasm, near the nucleus=>so are the centrioles.
Maybe this picture will be of some help. From Neil Campbell and Jane Reece, Biology, 7th edition.
you can clearly see them in the cytoplasm. and in the bottom right corner it tells you that they are only found in animal cells.
animal cell.jpg
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