RNA

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vergil5203
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RNA

Post by vergil5203 » Thu Feb 01, 2007 11:56 am

How mechanism of rRNA,tRNA and mRNA? what they are use for?

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Post by sachin » Thu Feb 01, 2007 5:46 pm

Search forum for same topic.....

or go here.......

http://www.google.co.in/search?hl=en&q=RNA&meta=
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Post by Locus » Thu Feb 01, 2007 7:48 pm

By genral, tRNA and tRNA is catalitic (first bind specific aminoacid and transefer to ribosome, second work within the ribosome and do general function of it), and mRNA is template for ptrotien sintesis...
but, by the Sachin post, Wikipedia, or ever Google will easyly give you much more significant results
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Post by canalon » Thu Feb 01, 2007 8:12 pm

Or our tutorials about cell biology here:
http://www.biology-online.org/1/1_cell.htm
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Re: RNA

Post by deepu.n » Wed Feb 07, 2007 4:33 am

vergil5203 wrote:How mechanism of rRNA,tRNA and mRNA? what they are use for?

all the three are used in photosynthesis

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Post by MrMistery » Wed Feb 07, 2007 10:08 pm

in an indirect way, yes. tRNA in synthesis of clorophil and all three in syntesis of enzymes. But directly, no.
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Post by whirlboy » Thu Feb 08, 2007 4:47 pm

Locus wrote:By genral, tRNA and rRNA is catalitic (first bind specific aminoacid and transefer to ribosome, second work within the ribosome and do general function of it), and mRNA is template for ptrotien sintesis...
but, by the Sachin post, Wikipedia, or ever Google will easyly give you much more significant results

that's correct,have a small publish mistake. :wink:
so the tRNA has a configuration of clover and more significance is the specific amino acid binding.

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Post by vergil5203 » Thu Feb 15, 2007 8:36 am

as far as i know is the process translation between tRNA n mRNA is inside the ribosome n from amino acid and finaly form protein.Is that correct? however rRNA is for? well,i juz know is "rRNA react wif protein to form ribosome"<---maybe wrg dis sentence so i ask for it coreect or not?

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Post by MrMistery » Thu Feb 15, 2007 3:58 pm

rRNA has the catalytic role in peptide bond formation. The enzyme previously known as peptidyl transferase is actually a ribozyme, the 23S rRNA(bacteria)
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Post by vergil5203 » Sun Feb 18, 2007 7:09 am

O i see..thank you very much

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Post by dipjyoti » Sun Feb 18, 2007 9:19 am

mRNA: Messenger RNA is RNA that carries information from DNA to the ribosome sites of protein synthesis in the cell. Once mRNA has been transcribed from DNA, it is exported from the nucleus into the cytoplasm (in eukaryotes mRNA is "processed" before being exported), where it is bound to ribosomes and translated into its corresponding protein form with the help of tRNA. After a certain amount of time the message degrades into its component nucleotides, usually with the assistance of RNA polymerases.

tRNA: Transfer RNA is a small RNA chain of about 74-95 nucleotides that transfers a specific amino acid to a growing polypeptide chain at the ribosomal site of protein synthesis during translation. It has sites for amino-acid attachment and an anticodon region for codon recognition that binds to a specific sequence on the messenger RNA chain through hydrogen bonding. It is a type of non-coding RNA.

rRNA: Ribosomal RNA is a component of the ribosomes, the protein synthetic factories in the cell. Eukaryotic ribosomes contain four different rRNA molecules: 18S, 5.8S, 28S, and 5S rRNA. Three of the rRNA molecules are synthesized in the nucleolus, and one is synthesized elsewhere. rRNA molecules are extremely abundant and make up at least 80% of the RNA molecules found in a typical eukaryotic cell.

In the cytoplasm, ribsomal RNA and protein combine to form a nucleoprotein called a ribosome. The ribosome binds mRNA and carries out protein synthesis. Several ribosomes may be attached to a single mRNA at any time.

Dr Robert W. Holley (January 28, 1922 – February 11, 1993) was an American biochemist, he was awarded the Nobel Prize in Physiology or Medicine in 1968 for describing the structure of alanine transfer RNA, linking DNA and protein synthesis.

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Post by MrMistery » Sun Feb 18, 2007 11:39 am

After a certain amount of time the message degrades into its component nucleotides, usually with the assistance of RNA polymerases.


RNA polymerases create the mRNA. It is degraded in a multiprotein structure called an exosome, which is similar to the proteosome that degrades proteins in 3d structure.
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