Control of Gene Expression Learning Objectives
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Questions and Answers

Which process alters the sequence of mRNA?

  • Editing (correct)
  • Methylation
  • Acetylation
  • Translocation

    • What happens when a premature stop codon is produced in apo-B-48?

  • The protein becomes shorter (correct)
  • The mRNA becomes unstable
  • The mRNA is degraded
  • The protein becomes longer

    • Which molecules bind to specific RNA structures and affect mRNA stability and translation?

  • Iron-regulatory proteins (correct)
  • Transcription factors
  • miRNAs
  • Histones

    • What is the role of miRNAs in gene expression?

    <p>They prevent protein synthesis</p> Signup and view all the answers

    What effect does acetylation of histones have on gene expression?

    <p>It promotes gene expression</p> Signup and view all the answers

    What effect does methylation of DNA have on gene expression?

    <p>It represses gene expression</p> Signup and view all the answers

    Where do transcription factors act to regulate target genes?

    <p>Nucleus</p> Signup and view all the answers

    What is the role of mRNA stability in iron metabolism?

    <p>It regulates iron-related proteins</p> Signup and view all the answers

    Which process leads to mRNA degradation or translational inhibition?

    <p>miRNA binding</p> Signup and view all the answers

    What is changed by deamination to produce a premature stop codon in apo-B-48?

    <p>A single base</p> Signup and view all the answers

    Which condition activates the lac operon in lactose metabolism?

    <p>lac+ and glu-</p> Signup and view all the answers

    What role does the lac repressor play in the lac operon?

    <p>It represses transcription</p> Signup and view all the answers

    What happens to cAMP levels when glucose is scarce?

    <p>They rise</p> Signup and view all the answers

    What is the role of CAP in the lac operon regulation?

    <p>It enhances RNA polymerase binding</p> Signup and view all the answers

    What is the role of the stringent factor in the stringent response?

    <p>It conserves energy</p> Signup and view all the answers

    What happens to the trp operon in trp high conditions?

    <p>It is repressed</p> Signup and view all the answers

    What happens to the trp operon in trp low conditions?

    <p>It is activated</p> Signup and view all the answers

    What is the role of attenuation in trp operon regulation?

    <p>It prematurely terminates transcription</p> Signup and view all the answers

    Which structural motif is used by proteins to bind DNA?

    <p>All of the above</p> Signup and view all the answers

    What is the role of STF in the coordinate regulation of the galactose circuit in yeast?

    <p>It recruits chromatin remodeling complexes</p> Signup and view all the answers

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