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eukaryotic cells

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Postby MrMistery » Fri Mar 11, 2005 9:18 pm

Biology is a strange thing adidasty.
If you look at the deffinition of eukaryotic cells you will get either that they have a nucleus or that they have membrane bound organelles. Red blood cells in mamals have neither of these.
Conclusion: They are not eukaryotic cells :D :D :D :D :D
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Postby thank.darwin » Sun Mar 13, 2005 1:14 pm

All eukaryotic cells have a nucleus... Red Blood cells are eukaryotic...
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Postby Poison » Sun Mar 13, 2005 3:58 pm

All completely organized cells have genetic material.
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Postby mith » Sun Mar 13, 2005 5:38 pm

@thank.darwin

from wikipedia.org

Erythrocytes in mammals are anucleate when mature, meaning that they lose their cell nucleus and thus their DNA. (The erythrocytes of all other vertebrates have nuclei.)

I didn't know that either.
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Postby biostudent84 » Sun Mar 13, 2005 7:44 pm

thank.darwin wrote:All eukaryotic cells have a nucleus... Red Blood cells are eukaryotic...


Not quite true...have you ever done the lab where you stain onion skin cells? I know it's quite common in the States at least...

The idea is to stain onion skin cells with iodine. Then, we spend about 15 minutes trying to find a cell that actually does have a nucleus.

I've always asked my professors why they don't have nuclei, but they didn't know...maybe Jelanen does.

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Postby MrMistery » Sun Mar 13, 2005 10:42 pm

What's wrong mithrill, didn't believe me when i said that red blood cells have a nucleus of other things except mamals? :))
By the way, i was joking about red blood cells not being eukaryotic cells

@Biostudent
I'll ask my teacher about that. It's strange
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Postby Poison » Sun Mar 13, 2005 10:49 pm

biostudent84 wrote:Not quite true...have you ever done the lab where you stain onion skin cells? I know it's quite common in the States at least...

The idea is to stain onion skin cells with iodine. Then, we spend about 15 minutes trying to find a cell that actually does have a nucleus.

I've always asked my professors why they don't have nuclei, but they didn't know...maybe Jelanen does.
Kyle


I had the same problem. :)
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Postby thank.darwin » Sun Mar 13, 2005 10:56 pm

biostudent84 wrote:Not quite true...have you ever done the lab where you stain onion skin cells? I know it's quite common in the States at least...

The idea is to stain onion skin cells with iodine. Then, we spend about 15 minutes trying to find a cell that actually does have a nucleus.

I've always asked my professors why they don't have nuclei, but they didn't know...maybe Jelanen does.Kyle


I have done that lab... My bio teacher told me the iodine wouldn't be able to stain the nucleus... Onion cells do have a nucleus... I might be wrong on this one?
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Postby Poison » Sun Mar 13, 2005 10:59 pm

Yes they DO have. :)
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Postby MrMistery » Sun Mar 13, 2005 11:55 pm

All vegetal cells have a nucleus? Is there any exception to this? I don't believe so...
And don't give me the phloem cells because in some books they have a nucleus and in others they don't so..
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Postby wyndslash » Fri Apr 22, 2005 3:56 am

where is the nucleus of an onion located?

thanks~! ^^
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Postby Poison » Fri Apr 22, 2005 5:26 pm

An onion doesn't have only one nucleus. they are in its cells.... is this the answer what you're looking for?
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