BIO 325 - Fall 2007 - TTh 2 to 330 - III Exam - key only

BIO 325 Fall 2007 - GENETICS(BIO 325 Fall 2007 T Th 2:00 3:30 PM Key III Exam 1 False The sigma subunit associates with the bacterial RNA

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Fall 2007 T, Th 2:00 – 3:30 PM Key - III Exam __________________________________________________________________________________________________ 1. False. The sigma subunit associates with the bacterial RNA polymerase only during the initiation phase of RNA synthesis. The sigma subunit helps the RNA polymerase bind to the promoter and stays associated with the polymerase until RNA synthesis has been properly initiated. 2. (a) False (b) True (c) False (d) False (e) False 3. The sequence “GU” can be found at the 5’ end of most introns, while the sequence “AG” can be found at the 3’ end of most introns. 4. Gene a | Gene b -35 -10 ________________________________________________________________ 3’ 3’ ________________________________________________________________ -10 -35 5. (i) The first AUG codon following the Shine-Dalgarno sequence (ribosome-binding site) functions as the start codon in bacterial mRNAs. Each coding region in a polycistronic bacterial mRNA is therefore preceded by a Shine-Dalgarno sequence. (ii)
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This note was uploaded on 03/20/2008 for the course BIO 325 taught by Professor Saxena during the Spring '08 term at University of Texas at Austin.

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BIO 325 Fall 2007 - GENETICS(BIO 325 Fall 2007 T Th 2:00 3:30 PM Key III Exam 1 False The sigma subunit associates with the bacterial RNA

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