Gene expression unconventional journey from dna final product. Ribosomal rnas (rrnas: nuclear chromosomes o o, need to mass produce them by taking genes and repeating it allows you to make lots of it. Linear chromosomes with lots of genes and non-coding dna o: don"t find any of the rrna genes on the normal nuclear chromosomes o rrna genes located elsewhere. Encoded on their own mini 11 kb circular molecule in the nucleus present in 100s of copies. Very rare instance of a non-linear nucleus in the chromosomes o. Mrnas must contain a lot of codons that are translated into amino acid (including initiation and termination codons. Mature mrnas have sequences a 5" and 3" ends that are not translated by affect efficiency with translation. 5" and 3" utrs located just after methylated cap and just before poly-a tail. Gene must have one more exon than it does intron.