BIO 111 Lecture Notes - Lecture 16: Allolactose, Permease, Operon
Document Summary
Initiation mrna, first trna and ribosomal subunits assemble: elongation. Synthesis from start codon to stop codon: termination. Complex disassembles at stop codon releasing completed polypeptide. Initiation: eukaryotic mrna has a 5" cap, cap is recognized and makes mrna bind to small ribosome subunit. c, binds in the p site, large subunit fully assembles the ribosome. It"s amino acid gets bonded to the growing polypeptide chain i. Cells can control how & when their genes are expressed. The same dna can be expressed very differently in different species! Others are regulated only expressed at certain times and in certain amounts. Save energy only respond to environment when you have to! On = get transcribed to mrna for use. Regulation at many levels: transcriptional regulation (common, rna processing. Transcription factors bind to dna near the promoter. Affects transcription of one or more nearby genes. Often proteins which help rna polymerase to bind efficiently.
