How does gene expression occur?
Genetic expression is a wide complex process. It must be regulated by a series of mechanisms. It starts of with transcription that gives rise to the RNA messenger (RNAm) from DNA. The RNAm in prokariotes is coupled with several ribosomes which are responsibles of translating proteins. In eukariotes RNAm that is made from DNA is immature, and it is called preRNAm. PreRNAm loses non-coding sections (called exons), becoming onto a RNAm mature. RNAm is coupled to ribosomes on Rough Endoplasmatic Reticle (RER) where translation happens. Translation is made when a new polypeptide is formed. The genetic code indeed says the order of pe polypeptides, but it doen’t give us a clue about it tridimensional structure. Tridimensional structure is given by post-translational processes. Translation occurs following transcription wherein the protein synthesis machinery gets into action and uses its tools to read out the message that the RNA holds. There are some genes without coding proteins, they work
