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Are all cilia "the same"?

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Are all cilia "the same"?

Postby planetluvver » Tue Apr 20, 2010 4:40 am

I am reading for entertainment Marine Biology by Castro and Huber, 1992. It is written at a very elementary level, and the author has already made a blunder that has put me on guard, invoking centrifugal force to explain tides.

Now, the author is discussing cell biology, and says that flagella and cilia have the same structure, which I can accept. However, then the author makes the leap from bacteria to eukaryotes, and moves right along to the human respiratory system.

While it is unimportant to the subject at hand, now that the question has come up, I am puzzled. Are these structures called cilia indeed the same structure across organisms? Or is the author being sloppy, and the same term is used to describe analogous organelles ?

Ilooked in the glossary at this website, and it did not really convince me that all cilia are the same.
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Postby plasmodesmata11 » Tue Apr 20, 2010 5:31 pm

for eukaryotic cilia and flagella, they have the same 9+2 microtubule structure, and the basal body structure of 9X3. they use the same protein motors. bacterial ones are different, however. They have different basal bodies consisting of protein rings that act like anchors. Then there's the hook, and then a single filament. There are no microtubules in these prokaryotic structures.
so keep your guard up for reading this book, i guess. :P
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Postby planetluvver » Wed Apr 21, 2010 5:52 pm

Thanks for the reply.

The book is really annoying me. Today I was reading that sexual reproduction is important to the survival of seaweeds. Just what exactly does it mean? Perhaps it is just me, and I am being overly critical of the author.

But I am in the process of disposing of many of my science books, so I would not likely buy another one, anyway.
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