BISC 101 Lecture Notes - Lecture 4: Rna Polymerase Ii, Polyadenylation, Tata Box
29 Oct 2018
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Document Summary
Dna > genes (genotype) > traits (phenotype) > encoded by proteins (polypeptides) Produces pre-mrna (processing) produces mrna (message) mrna then (translated), forming proteins. Rna polymerase ii codes for matching base in 5" > 3" direction. Must bind to a region on the dna (promoter) Transcription factors bind at the site to initiate transcription. Splicing shorter molecule that consists solely of expressed sequences (exons) Add a 5" cap region and poly(a) tail. 5" cap region protects mrna from degradation. Codons never give rise to more than one amino acid. More than one codon can specify for the same amino acid. Transfer rna (trna) carry amino acids to form polypeptides a. b. Anti-codon matches to codon to place amino acid. Each trna has an aminoacyl t-rna synthetase (20 amino acids) Methionine transferred from p to a trna moves from p to e. New amino acid moves from a to p. Termination stop codon codes for a protein that brings in h2o.
