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quiz8 - Biol241 Quiz 8 1 A mutation in the gene for the...

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Biol241, Quiz 8 3/12/2010 1) A mutation in the gene for the yeast regulatory protein GAL4 causes yeast to grow poorly on galactose. What is the function of GAL4? a) It is a substrate that binds and activates a transcriptional activator. b) It is a transcription activator for the galactose-digesting enzyme gene. c) It is a transcription repressor that prevents expression of yeast galactose- digesting enzymes. d) It is an enzyme that metabolizes galactose. 2) siRNAs and miRNAs are produced by 3) miRNAs usually inhibit gene expression by
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