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Microbiology chapter 8

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sejerili's version from 2015-11-17 00:59

Section

degenerate aminoacids that are signaled by several alternative codons
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start codon initiates the synthesis of the protein molecules
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what is the start codon AUG
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what is AUG methionine
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what are the stop codons UAA, UAG, UGA
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what is a stop codon n stops proteing synthesis
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what is the structure of TRNA It has an anticodon: sequence of three bases that are complementary to a codon
has its corresponding aminoacid attached to end
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TRNA FUNCTIONA recognize and decode an MRNA codon, and transport the required aminoacids
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structure of ribosomes made of rna and proteins, catalyzes formation of peptide bond between aminoacids and joins aminoacids to form protein
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A SITE site point of entry for the aminoacid TRNA
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P SITE site where the peptidyl TRNA is formed
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E SITE exit site of the now uncharged trna after it gives its amoniacid to the growing peptide
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events that ocurr during translation 1. ribosome reads mrna 3 bases at a time
2. reads UG , allos trna with anticodon UAC to bind to codon AUG on mrn , trna brings met to ribosomes
3. met and gly are joined together
4. complementarity allows trna to bind to mrna to bring the correct aminoacid into place
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coupled transcription translation can occur simultaneously in bacteria. mrna undergoes translation while its being made, translation can begin before transcription is completed
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expression of genes that code for proteins gene undergoes transcription to make mrna, which is then read by ribosomes to make protein
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expression of genes that code for rrna, trna gene undergoes transcription only. rna polymerase reads base sequence of of dna to make rrna or trna. once they are made, they perform functions.
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what happens when gene expression is activated in prokaryotes takes place at transcriptional level , expression is turned on by allowing transcription to occur . expression is turned off by inhibiting transcription
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what happens when expression is turned off repressor binds to operan, transcription of structural genes is turned off