Answers-to-Lecture-Q_40924

Howwouldonecharacterizethesubstancexoperon a

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Unformatted text preview: e three enzymes for the production of substance X: A → B → C → X When these cells are cultured in growth medium containing substance X, the 3 enzymes are not detected. How would one characterize the substance X operon? A. Inducible B. Repressible C. Neither A or B Answer: Repressible; the presence of “X” represses (prevents) transcription of “X” operon structural genes (which is why the enzymes of the pathway are not detected). Similar to question #9: Which level of gene expression is not correctly matched? A. B. C. D. E. Answer: “A”; transcriptional control determines whether or not a transcript will be made; post‐ transcriptional control involves mechanisms using the synthesized transcript, such as mRNA degradation due to removal of 5’ cap or 3’ polyA tail or splicing. Transcriptional: mRNA is degraded Post‐transcriptional: splicing exons together Translational: affect ribosome function Post‐translational: protein is modified Transcriptional: lac repressor binds operator...
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