Biology 1002B Lecture Notes - Lecture 12: Release Factor, Start Codon, Ribosomal Rna

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Identify the sequence of standard start and stop codons. Start: nontemplate 5" aug 3"; template 3" tac 5" (rna understood) Stop: non template 5" uaa, uag, uga 3"; template 3" att, atc, act 5". Genes more spread out on many chromosomes. Groups of genes producing proteins with related. Groups of genes producing proteins with related functions are not organized into operons. Mrna that must have its introns excised. Mrna transported out of nucleus to ribosomes. 5" cap, poly-a tail added before going to translation (post translational) functions are organized into operons. Transcription and translation can occur simultaneously since ribosomes are readily there. Mrna doesn"t have a nucleus or nuclear membrane protecting genes (but not floating) Mrna tends to be stable, used multiple times. Efficient, but prevents eukaryotes to make fast response changes to environmental disruptions. Mrna of prokaryotes is unstable, allow creation of new mrna, which has more opportunities to adjust for changing environmental conditions.

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