SOQ14_FALL - General Biology Study Objective Questions 14...

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1 General Biology Study Objective Questions # 14 Control of Gene Expression 1. Differentiate between transcriptional and post-transcriptional control of gene expression. Which is most common? Transcriptional control is used to maintain homeostasis; RNA polymerase fixes the DNA before transcription most common effected by the binding of proteins to regulatory sequences within the DNA Post-transcriptional control occurs after transcription and affects mRNA 2. How is the binding of RNA polymerase to a gene’s promoter sequence linked to transcriptional control? RNA polymerase controls the transcription of particular genes 3.List and briefly define the four primary structural motifs of DNA-binding regulatory proteins. Helix-turn-helix motif – two alpha-helical segments of the protein is linked by a short, non-helical segment one helix goes into the groove and the other helix butts up against the outside of the DNA Homeodomain motif – plays a critical role in the development of eukaryotes, center of the homeodomain is occupied by a helix-turn-helix motif that binds to the
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SOQ14_FALL - General Biology Study Objective Questions 14...

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