BIOL 1090 Lecture Notes - Lecture 11: Ribosome, Start Codon, Amine
Document Summary
Inrons (or intervening sequences) are noncoding sequences located between exons: removed from the pre-mrna and are not present in the mature mrna, variable in size and may be very large (muliple kb) Exons (both coding and noncoding sequences) are composes of the sequences that remain in the mature mrna ater splicing. The mature messenger rna contains both coding and non-coding sequences. The non-coding sequences are untranslated and are therefore referred to as the 5" or 3" untranslated region. Diferences in the iniiaion, elongaion, terminaion and processing of transcripts between. 10 and -35bp regions upstream of mrna start site. Several genes can be transcribed on one mrna transcript. Mrna does not undergo further processing transcripion and translaion can occur simultaneously terminaion involves an rna hairpin sequence followed by 6 as, polymerase falls of (rho-independent mechanism) Tata box and caat box about -20 and. Transcripion factors bind dna, which then recruits the polymerase.