Biological Molecules and Cell Reactions Question

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banaji727
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Biological Molecules and Cell Reactions Question

Post by banaji727 » Wed Sep 23, 2009 8:56 am

Which types of molecules carry out the cell's reactions?

We're studying the 4 main biological molecules (carbs, lipids, proteins, nucleic acids) and I'm not sure about this one. My guess would be nucleic acids since they send out orders for the creation of proteins and all that.

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biohazard
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Post by biohazard » Wed Sep 23, 2009 12:38 pm

By reactions I assume the question means things that require enzymic activity or other such "outside" help. Whilst nucleic acids work as blueprints for enzymes along other things, the actual cellular reactions are not usually directly performed by them. RNA, though, has certain transport and enzymatic functions.

But try checking out the structure and function of enzymes, the answer might be found there.

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JackBean
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Post by JackBean » Wed Sep 23, 2009 1:44 pm

the answer is protein, as biohazard writes, but in minor also RNA and DNA too ;)
http://www.biolib.cz/en/main/

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Darwin420
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Post by Darwin420 » Thu Sep 24, 2009 3:51 am

This is a really odd question. In fact, all of them are needed, they are the 4 macromolecules that all life have. If you don't have nucleic acids than you don't have DNA, if you don't have DNA you don't have proteins and so on. These are all needed for a cell to carry out a function. This is a weird question, shitty really.

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JackBean
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Post by JackBean » Thu Sep 24, 2009 8:53 am

to Darwin: But the question is, which molecules carry out the reactions, not which are needed ;)
http://www.biolib.cz/en/main/

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Darwin420
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Post by Darwin420 » Thu Sep 24, 2009 3:37 pm

yea...I realized that after. It is a stupid question.

but in that case, it is protien and DNA, RNA.

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Post by kolean » Fri Sep 25, 2009 9:48 pm

Do you think carbs in the form of glycosylation is also needed to carry out the cell's reactions?

Lipids in the form of phospholipids are needed in the plasma membrane of the cell and all the organelles and the vesicles that transport the cell's products.

They all seem to be responsible for carrying out the cell's reactions.

Perhaps the question needs to be more specific as oppose to being too general.

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JackBean
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Post by JackBean » Sat Sep 26, 2009 1:08 pm

No, the reactions are catalysed mainly by proteins (polypeptides), in minor by RNA and also by DNA.
The glycosylations of proteins, to my knowledge, are not neeeded for the catalysis (as I know, they function as stabilizor or antigen or stuff like that). Also, the lipids are not needed for the reactions as that. Yes, they may transport some stuff, they may make some enviroment for the reaction (e.g. electron transport in mitochondria), but they are not involved in the reaction, as they are.
http://www.biolib.cz/en/main/

Cis or trans? That's what matters.

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MrMistery
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Post by MrMistery » Sat Sep 26, 2009 2:53 pm

DNA doesn't catalyze anything
"As a biologist, I firmly believe that when you're dead, you're dead. Except for what you live behind in history. That's the only afterlife" - J. Craig Venter

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JackBean
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Re:

Post by JackBean » Mon Sep 28, 2009 8:22 am

MrMistery wrote:DNA doesn't catalyze anything

Try find article by Ronald Breaker in Journal of the American Chemical Society 126, 2004. We have high-day today, and it's probably not even accesible from our Uni
(if will you be able to get the pdf, could you send it to me?)

EDIT
Here is his link
http://breaker.research.yale.edu/index_ ... ozymes.htm
http://www.biolib.cz/en/main/

Cis or trans? That's what matters.

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