BIOL 1090 Lecture Notes - Lecture 12: Euchromatin, Heterochromatin, Ribosomal Rna
Document Summary
35 sequence: well-conserved promoter sequence, binding site for rna polymerase. 10 sequence: a/t rich, helps create transcription bubble. Inverted repeat just upstream of an a-rich sequence. Shine-dalgarno sequence: near 5" end of mrnas," complementary to a small ribosomal subunit rna, helps position ribosom. Tata box: a/t-rich, helps to position the rna polymerase. Aauaa 30 bp upstream of a c/-rich sequence. Kozak sequence: rccaugg, optimal core sequence context for a start codon. In general, genome size increases with organismal complexity however the number of genes does not increase in proportion. Transcription is a major point of regulation of gene expression in eukaryotes. Genes consist of enhancers, as well as promoters and coding regions. Enhancers regulate where and when genes are expressed. Many genes consist of the transcribed sequence, a promoter and one or more enhancers. Basal transcription factors promoter to facilitate rna polymerase binding. Proteins that bind to specific sequences within the.
