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yet another eukaryote question

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yet another eukaryote question

Postby jimmie » Sat Oct 22, 2005 2:03 am

Hi,

I know that there are different types of cells: eukaryotes and prokaryotes, and that plant, animal, and human cells are eukaryotes cells (true?), and that there may be sub-types (thousands?)of prokaryotes.

My question is: Of all the possible types of cells that are known to scientists, do ONLY eukaryotes have a nucleus?

OK, maybe that was a few questions.

:D

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Postby mith » Sat Oct 22, 2005 2:17 am

eukaryote= true nucleus
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Postby tursiops » Sat Oct 22, 2005 8:02 am

ONLY eukaryotes have a nucleus?

yes it's right! But there are some protists that have 2 or more nuclei, anyway they belong to Eukarya.

Byee!
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Postby Morris » Sat Oct 22, 2005 3:15 pm

Yes eukariotes only have a nucleus, procariotes no.
http://www.forumbiotech.forumfree.net(In italian)
http://www.forumfree.net/?c=37503 (international medicine forum)(In english)

http://u2forum.forumfree.net (in Italian)
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Postby jimmie » Sat Oct 22, 2005 3:23 pm

and, plants and animals and humans are eukaryotes, right?

What other types of beings are eukaryotes?

What type of beings have 2 nucleus?
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Postby tursiops » Sat Oct 22, 2005 3:49 pm

Hi Jimmie :)
and, plants and animals and humans are eukaryotes, right?

yes that's right!

Every kind of beings that present one or plus nuclei (with a nuclear membrane) are Eukaryotes.
Paramecium is a protist that has 2 nuclei: 1 called micronucleus and 1 called macronucleus (I'm sorry if I wrong some word in english).

There are 5 kingdoms:
Monera--> are prokaryotes without nucleus
Protista; Fungi; Plantae; Animalia--> are eukaryotes with nuclei

I've found this site: http://waynesword.palomar.edu/trfeb98.htm

See ya :)
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Postby MrMistery » Sat Oct 22, 2005 4:53 pm

Yes, there are cells with 2 nuclei: a better example than paramecium would be lambria intestinalis which has 2 nuclei with the same function. Also the main cells in the liver have 2 nuclei.
There are also cells with more nuclei: the osteoclast and the skeletical muscle fiber are only a few.
There are also eukaryotic cells that lose their nuclei on their way to specialisation: the adult mamal red blood cell and the phloem cell. But they are still eukaryotic cells since they had it once :lol: :lol:
Sorry, but biology isn't that simple :lol:
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Postby tursiops » Sat Oct 22, 2005 5:02 pm

Hi MrMistery! :)
Your explanation is perfect! thanks a lot.
Biology is not that simple but is very very interesting
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Postby MrMistery » Sun Oct 23, 2005 5:44 pm

Lol... My answer was far from perfect. A perfect answer to this question would have 10 pages at least.
And yes, i agree, biology is very interesting
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