Regulation of Gene Expression in Bacteria
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Questions and Answers

What is one reason why gene expression in bacteria needs to be controlled precisely?

  • To decrease the ATP consumption
  • To prevent wasteful synthesis of unnecessary materials (correct)
  • To promote adaptation to a wide range of environments
  • To increase the synthesis of structural proteins
  • How many genes are typically needed by bacteria at any one time?

  • 500-700
  • 700-9000
  • 1000-2000
  • 600-800 (correct)
  • Which of the following bacteria has a much higher number of proteins that regulate its response to different stimuli?

  • Helicobacter pylori
  • Escherichia coli
  • Pseudomonas aeruginosa (correct)
  • Staphylococcus aureus
  • What kind of proteins does a bacterial cell need to produce at very high levels?

    <p>Structural proteins</p> Signup and view all the answers

    What is the approximate ATP consumption per protein during gene expression in bacteria?

    <p>$3000$ ATP molecules</p> Signup and view all the answers

    Why does Helicobacter pylori have a small number of proteins that regulate its response to different stimuli?

    <p>It is adapted to the human stomach</p> Signup and view all the answers

    What is the main factor influencing the expression of individual genes in bacteria?

    <p>The efficiency with which the gene is transcribed</p> Signup and view all the answers

    Which regulatory factor determines the amount of specific mRNA produced in a cell?

    <p>The stability of the mRNA</p> Signup and view all the answers

    Which post-translational effect is especially important as a mechanism for regulating the function of specific proteins?

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

    What is necessary for the conversion of polypeptide chains into a biologically active conformation?

    <p>Protein folding</p> Signup and view all the answers

    What is likely to be higher when there are several copies of a gene?

    <p>The level of product</p> Signup and view all the answers

    Which factor mainly determines the efficiency with which the gene is transcribed in bacteria?

    <p>Promoter activity</p> Signup and view all the answers

    What affects the rate of translation mainly in bacteria?

    <p>Codon usage</p> Signup and view all the answers

    What is important for the metabolism and physiology of a cell?

    <p>Temporary effects such as inhibition and activation of individual enzymes</p> Signup and view all the answers

    Which type of RNA has considerably more stability due to a high degree of secondary structure?

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

    When does gene copy number become important for controlling the normal metabolic activities in a bacterial cell?

    <p>During plasmid-mediated characteristics</p> Signup and view all the answers

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