micro RNA

[yaracuy]

How is the micro RNA produced ? Is it a part of destroyed Messenger RNA ?

Doe the Ribosomal RNA becomes hydrolyzed after a give proteine is made ?

 

[Hercules Rockefeller]

How is the micro RNA produced?

MicroRNAs are encoded by genes. For a given miRNA, a long precursor RNA is transcribed from the gene and the miRNAs are produced by the DICER enzyme which cleaves the precursor into the 21-23 nucleotide miRNAs.

Is it a part of destroyed Messenger RNA ?

No. Mature miRNA is produced via cleavage (ie. destruction) of the larger precursor RNA, but that precursor RNA is not mRNA (that encodes a protein).

Does the Ribosomal RNA becomes hydrolyzed after a give proteine is made?

As far as I know, a ribosome (and the rRNA that it contains) has a much longer lifetime than the translation of a single protein. However, I don’t know what the lifetime of rRNA is. Presumably it has a finite lifetime after which it is degraded and the nucleotides re-used in the synthesis of new RNA of one type or another.

 

[yaracuy]

OK thanks . here is an other question , for my enlightening , The degradation of messenger RNA the fragments are codons of plain nycleic acids ????