Transcription Factors: Activators and Repressors
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Questions and Answers

What is the role of positive regulators in transcription?

  • Block transcription of the gene affected
  • Increase stability of RNA pol to promoter and allow more effective binding (correct)
  • Physically alter the ability of RNA pol to bind to promoter
  • Tell where RNA pol should bind

How do negative regulators affect transcription?

  • Increase stability of RNA pol to promoter and allow more effective binding
  • Block transcription of the gene affected
  • Tell where RNA pol should bind
  • Physically alter the ability of RNA pol to bind to promoter (correct)

What characteristic pattern of growth did Jacob and Monod observe when E. Coli was grown in the presence of lactose and glucose?

  • Linear growth pattern
  • Diauxic growth pattern (correct)
  • Logarithmic growth pattern
  • Exponential growth pattern

What enzyme is required for the catabolism of lactose?

<p>$eta$-galactosidase (C)</p> Signup and view all the answers

During which phase of growth does glucose get used while lactose is not used at all?

<p>First logarithmic phase (phase 1) (D)</p> Signup and view all the answers

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