PrfA is a protein that serves as a global regulator of virulence genes in Listeria, a bacterium that can cause severe food poisoning. Below host body temperatures the MRNA that contains the PrfA coding sequence, exists in a conformation that hides the ribosome binding site, and the protein isn't made. Upon entry into a host and a rise in temperature, hydrogen bonds in the MRNA break, exposing the ribosome binding site and PrfA is synthesized. What level of gene regulation is controlling the expression of this transcription factor? Is this transcription factor an activator or a repressor? O transcriptional control; activator O translational control; repressor O translational control; activator O transcriptional control; repressor

PrfA is a protein that serves as a global regulator of virulence genes in Listeria, a bacterium that can cause severe food poisoning. Below host body temperatures the MRNA that contains the PrfA coding sequence, exists in a conformation that hides the ribosome binding site, and the protein isn't made. Upon entry into a host and a rise in temperature, hydrogen bonds in the MRNA break, exposing the ribosome binding site and PrfA is synthesized. What level of gene regulation is controlling the expression of this transcription factor? Is this transcription factor an activator or a repressor? O transcriptional control; activator O translational control; repressor O translational control; activator O transcriptional control; repressor

Human Heredity: Principles and Issues (MindTap Course List)

11th Edition

ISBN:9781305251052

Author:Michael Cummings

Publisher:Michael Cummings

Chapter9: Gene Expression And Gene Regulation

Section: Chapter Questions

Problem 10QP: The pre-mRNA transcript and protein made by several mutant genes were examined. The results are...

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A newly identified protein from the cells of the Panopyra plant on Pandora was shown to inhibit translation of its target genes by binding to the 5’ UTR of the mRNA and preventing ribosome binding. A possible way this inhibition may be relieved by an sRNA would be: Group of answer choices a)The sRNA acts as a silencer, suppressing the inhibitory protein and allowing translation to take place. b)The sRNA acts as a decoy, sequestering the inhibitory protein and allowing translation to take place. c)The sRNA acts as a marker, flagging the inhibitory protein for ubiquitination and allowing translation to take place.
A newly identified protein from the cells of the Panopyra plant on Pandora was shown to inhibit translation of its target genes by binding to the 5’ UTR of the mRNA and preventing ribosome binding. A possible way this inhibition may be relieved by an sRNA would be: Group of answer choices 1.The sRNA acts as a marker, flagging the inhibitory protein for ubiquitination and allowing translation to take place. 2.The sRNA acts as a decoy, sequestering the inhibitory protein and allowing translation to take place. 3.The sRNA acts as an enhancer, suppressing the inhibitory protein and allowing translation to take place. 4.The sRNA acts as a silencer, suppressing the inhibitory protein and allowing translation to take place. Which one is the correct?
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