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Which came first the DNA, RNA or protein

Discussion of all aspects of biological molecules, biochemical processes and laboratory procedures in the field.

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Postby Nite » Tue Jan 03, 2006 5:25 pm

i would think that it's protein since amino acid has smaller structure than nucleotides...
if it were to be protein, perhaps earliest form of entity to exist are something similar to prions??
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Postby Ultrashogun » Wed Jan 04, 2006 7:56 am

The Hypercycle theory explains this, it says that Nucleotids formed because of organic molecules in the primordial atmosphere combined to form small RNA molecules which catalysed, like ribozymes, the formation of more RNA.

So I guess it was the RNA because it can function as an enzyme on top of storing information.
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Postby victor » Wed Jan 04, 2006 1:23 pm

Nite wrote:if it were to be protein, perhaps earliest form of entity to exist are something similar to prions??


For Prions, you forget one thing....it's "infectious" word...Prions are kind like an infectious proteins that synthesized by the cell itself...
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Postby reem » Thu Jan 05, 2006 10:18 pm

well..........
i think after the discovery of a human cell (old one 100000000000000000000000000000000000000000000 years ago :shock: )

evolution is not longer considerd any more ! :roll:
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Postby MrMistery » Fri Jan 06, 2006 9:07 pm

what human cell? i don't know of anyone that old..
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Postby alextemplet » Fri Jan 06, 2006 10:35 pm

I think someone forgot to take his finger of the "0" button . . . :shock:
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Postby Dr.Stein » Sat Jan 07, 2006 7:39 am

Viewed from the protein synthesis - DNA is a template for RNA, then RNA will initiate the protein synthesis

Viewed from the evolution - amino acid was created at the first time as a major component of organism (Oparin) but this still a theory since none able to prove on creating a organism from ancient components as mentioned by Oparin.

So...?
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Postby reem » Sat Jan 07, 2006 12:31 pm

will i dont think my molecular biology doctor was lying to the whole class :?

they found this cell and measure its radiation and found out that its a very old cell :!:

and researches are still on it !

:)
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Postby victor » Sat Jan 07, 2006 12:48 pm

I also have some difficulities finding the related references in my Microbiology book: cell's ancestor.
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Postby MrMistery » Sat Jan 07, 2006 8:06 pm

a human cell that old? where did they find it? and how did they decide it was human and how did they decide it was that old? Tell your professor to give a reference or people will probably think he is insane
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Postby reem » Sat Jan 07, 2006 9:27 pm

i will as soon as he come back from France :)
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Postby pitch » Sat Jan 07, 2006 9:57 pm

My opinion is that the first wich appeared necessarily need to have at the same time an informative fonction and a catalic fonction, although RNA hasn't a high stability, it is for me the most serious candidate. :wink:

If the subjet interest you I advice you to read, a conceptually marvellous book: The Selfish Gene,2nd Ed. by Richard Dawkins
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