Quiz 4key - 1. Quiz 4 key, Biology 340, General Genetics,...

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Quiz 4 key, Biology 340, General Genetics, Spring, 2008 1. Please draw a gene with three exons. Indicate the transcription start site, the 5’ and 3’ untranslated regions (UTR), the exons and introns. The polypeptide that the gene codes for is 675 amino acids long. Please indicate a size of the three exons that is consistent with that polypeptide (there are many correct answers). [Alternative splicing is not part of this question/answer.] The total number of base pairs necessary to code for a polypeptide of 675 amino acids is 2025; exons could have the following sizes (but there are many possible answers) – exon 1 – 1200, exon 2 – 125, exon 3 – 700. [note that the bases in each exon does not have to be in multiples of three, but of course the total number of bases in the exons does need to be.] 2. a) The processes of transcription and translation are coupled in prokaryotes. Please explain. b) those two processes are not coupled in eukaryotes. Why not? a) As soon as transcription is underway, translation can be initiated at the
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This note was uploaded on 04/27/2009 for the course BIO 340 taught by Professor Steele during the Spring '09 term at University of Arizona- Tucson.

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Quiz 4key - 1. Quiz 4 key, Biology 340, General Genetics,...

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