Where RNA is present?
in cytoplasm or nucleus or both of them.
Thank you for using the Jiskha Homework Help Forum. I'd begin with the information found on Wikipedia:
http://en.wikipedia.org/wiki/RNA (the basics)
http://en.wikipedia.org/wiki/RNA_interference (interference)
http://www.rnajournal.org/ (The RNA Publication with articles)
http://www.rnabase.org/primer/ (a primer on RNA)
RNA, or Ribonucleic acid, is present in both the cytoplasm and the nucleus of a cell.
In the nucleus, RNA is involved in various processes. It is transcribed from DNA by the enzyme RNA polymerase during a process called transcription. This RNA is known as pre-mRNA and undergoes further processing including the addition of a 5' cap and a poly-A tail, as well as splicing to remove introns. This processed mRNA then is transported out of the nucleus into the cytoplasm.
Once RNA is in the cytoplasm, it plays crucial roles in protein synthesis. Ribosomes, which are composed of RNA and proteins, read the mRNA and use it as a template to produce proteins through a process called translation. This mRNA can also be involved in other processes such as RNA interference, where it is used to regulate gene expression.
So, to summarize, RNA is present in both the cytoplasm and the nucleus, with the nucleus being the site of RNA synthesis, and the cytoplasm being the site of RNA's functional activities such as protein synthesis.