Handout12GeneExpr - Bio 311C Handout 12 Control of Gene...

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Bio 311C Handout 12 – Control of Gene Expression Nov 1 – prokaryotes, Nov 3 – eukaryotes How are genes turned on and off in prokaryotes (bacteria )? Section 18.1, figures 18.2, 18.3, 18.4 Learning objectives: 3-53. Some proteins bind near a gene’s promoter and act like repressors of transcription, while other proteins act like activators . What is the effect of each of those on RNA polymerase? 3 54. Prokaryotic cells can have coupled transcription and translation, that is, simultaneous transcription and translation of the same mRNA molecule (Fig.17.24). Why can’t eukaryotes? 3‐55. Bacteria have only one chromosome. Explain why a mutation thus has a more significant effect. 3-56. A bacterial operon consists of what? Are human genes organized in operons? 3‐57. An operon with one regulatory region and three protein‐coding genes will have how many promoters? Related: Explain how bacteria can make one mRNA molecule that contains the code for several proteins.
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