Question

what hapens in rna processing

Answer 1

Welcome To Open Study @brenda72 :)
The steps of RNA processing:

•Synthesis of the cap. This is a modified guanine (G) which is attached to the 5′ end of the pre-mRNA as it emerges from RNA polymerase II (RNAP II). The cap
◦protects the RNA from being degraded by enzymes that degrade RNA from the 5′ end;
◦serves as an assembly point for the proteins needed to recruit the small subunit of the ribosome to begin translation.
•Step-by-step removal of introns present in the pre-mRNA and splicing of the remaining exons. This step takes place as the pre-mRNA continues to emerge from RNAP II.
•Synthesis of the poly(A) tail. This is a stretch of adenine (A) nucleotides. When a special poly(A) attachment site in the pre-mRNA emerges from RNAP II, the transcript is cut there, and the poly(A) tail is attached to the exposed 3′ end. This completes the mRNA molecule, which is now ready for export to the cytosol. (The remainder of the transcript is degraded, and the RNA polymerase leaves the DNA.)
Source:
http://users.rcn.com/jkimball.ma.ultrane...

Answer 2

does it always result in the same final mrna?

Answer 3

I think this link will help: http://en.wikipedia.org/wiki/Messenger_RNA

Answer 4

thank you

Answer 5

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\(\Large\ Thank\ You\ For\ Using\ OpenStudy!!\)

Answer 6

@brenda72: No, the final mRNA is different unless the parent genetic code (as spelled out in its DNA template used to transcribe the mRNA in the first instance) was the same. This may also differ from one time/location to another within the cell.