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PLANT AND ANIMAL CELLS

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

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Postby victor » Sat Dec 03, 2005 2:20 pm

??I think that vacuoles are used as a starch storage and the rest of metabolism...but not enzymes....am I wrong?
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Postby MrMistery » Sat Dec 03, 2005 2:34 pm

Sorry to dissapoint you victor but he is right. Vacules are the counterparts, so to speak, of lysosoms in the animal cell, reason for some scholars to name them fitolysosomes. Here are the roles of vaculoes in plants(the ones i can remember):
-in cellular digestion(same as animal lysosomes)
-in depositing: sucrose(enters the vacuole by a H+ assisted antiporter), Na,Ca(that also enter the vacuole by a proton antiporter), Cl, nitrates(enter the cell through channels)
- in regulating cellular volume(as we know, in plants the vacuole is 70-80% of the cell volume)
-in polenisation(they accumulate antocyan pigments)
The vacuole has an extremely well developed H+ pump, that can give the vacuole a pH of even 2! This is a mechanism that is characteristic to plant cells:
UTP --> UMP +Pi~Pi
It is one of the only cases where uridine triphosphate is used as an energy source in the living world. The vacuole's H+ pump works on pirophosphate

Now, the plant cell doesn't store starch in vacuoles, it stores it in a special kind of plastid called amiloplast.

Check the alberts book on the subject for more info, that is where i learned all this stuff..
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Postby animejunkie13 » Mon Jan 02, 2006 8:45 am

th1_rhs13 wrote:Is that so? My book regards lysosomes as being the counter part of Vacuoles in Animal cells.

Also they serve as a an Enzyme storage as well as digestion--hence the correlation to lysosomes.

yeah, but lysosomes are in plant cells too, so, why would they be there?
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Postby Poison » Mon Jan 02, 2006 9:30 pm

There are no lysosomes in plant cells. There are just some particles to do some work.
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Postby Enzyme » Wed Jan 04, 2006 6:29 pm

Find the differences :wink:.
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Postby MrMistery » Wed Jan 04, 2006 9:55 pm

nice pictures. where did you get them from?
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Postby Enzyme » Thu Jan 05, 2006 12:01 pm

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Postby CoolJay221 » Fri Jan 06, 2006 6:44 pm

plant cells have chloroplasts and animal cells don't. animal cells have centroils and plants don't. plant cells ahve a cell wal and animal cells don't.
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