I do not want to know how a nucleotide is composed (general answer to this question), but how many nucleotide-units make up a whole RNA- or DNA-Strang. Thank you.
I agree with Eric, but I am not sure why Aleksandar would like to know this number. For instance, I am working with DMD gene, which is aprox 2.4 Mb long, and my transcript of interest is roughly 14 Kb.
Thus, you will have to determine that for each gene/transcript of interest.
The length of DNA coding regions and the processed mRNA(s) will very depending on the gene, the species and the post-transcriptional splicing. What gene or species are you studying?