A(n) _____ is a specific nucleotide sequence in DNA that binds RNA polymerase, positioning it to start transcribing RNA at the appropriate place.
  • genes of an operon
  • operon
  • regulatory genes
  • promoter
AraC binds to _____ in the absence of arabinose.
  • initiator
  • regulatory gene only
  • initiator and operator
  • genes of an operon
operon not transcribed
  • lactose absent
  • lactose present, glucose absent
  • the operator
  • lactose present, glucose present
AraC acts as _____ in the presence of arabinose.
  • repressor
  • initiator and operator
  • initiator
  • activator
At which of the following stages does transcriptional control occur? a b c DNA ——> mRNA ——> protein ——> activated protein
  • post-translational control
  • D
  • blue
  • a
AraC acts as _____ if arabinose is present but a mutation in araD enzyme renders it non-functional.
  • repressor
  • activator
  • operator
  • initiator and operator
The _____ is/are arranged sequentially after the promoter.
  • initiator and operator
  • regulatory gene only
  • regulatory genes
  • genes of an operon
operon transcribed at a HIGH rate
  • lactose absent
  • lactose
  • the operator
  • lactose present, glucose absent
Does transcription of the ara operon occur in the absence of arabinose?
  • No
  • not bound to lactose
  • Yes
  • initiator
Suppose you analyze the protein-coding sequence of the lacZ and lacY genes of cells from the three mutant colonies and find that these sequences are wild type (normal). What other region of the lac operon might be altered to account for the mutant phenotype of these colonies?
  • lactose absent
  • regulatory genes
  • the lac promoter
  • not transcribed
Does transcription of the ara operon occur if a mutation prevents arabinose from binding to AraC?
  • blue
  • operator
  • Yes
  • No
Does transcription of the ara operon occur if arabinose is present but a mutation in araD enzyme renders it non-functional?
  • repressor
  • No
  • operon
  • Yes
Which of the following levels of gene expression control allows a cell to respond most rapidly to a changing environment?
  • Interaction of lactose with the repressor
  • initiator and operator
  • Jacob and Monod
  • post-translational control
AraC binds to _____ if a mutation prevents arabinose from binding to AraC.
  • initiator
  • regulatory gene only
  • not bound to lactose
  • initiator and operator
In this animation the blue sphere represents _____.
  • white
  • not transcribed
  • regulatory gene only
  • lactose
Does transcription of the ara operon occur in the presence of arabinose?
  • Yes
  • operator
  • No
  • white
Does arabinose metabolism occur in the absence of arabinose?
  • Yes
  • No
  • genes of an operon
  • initiator
Regulatory proteins often bind to the _____ to control expression of the operon.
  • not bound to lactose
  • initiator
  • promoter
  • operator
Colonies of what color are produced by cells with functioning copies of β-galactosidase?
  • white
  • blue
  • lactose
  • inducer
operon transcribed at a LOW rate
  • lactose present, glucose absent
  • lactose absent
  • the operator
  • lactose present, glucose present
Does arabinose metabolism occur if arabinose is present but a mutation in araD enzyme renders it non-functional?
  • No
  • Yes
  • operon
  • a
Regarding regulation of the ara operon, what would be the effect of a mutation that removes the part of the AraC protein that binds to RNA Polymerase?
  • initiator
  • Interaction of lactose with the repressor
  • post-translational control
  • Transcription would not occur at high levels in either the presence or absence of arabinose.
Does arabinose metabolism occur if a mutation prevents arabinose from binding to AraC?
  • blue
  • Yes
  • initiator
  • No
A(n) _____ is a stretch of DNA consisting of an operator, a promoter, and genes for a related set of proteins, usually making up an entire metabolic pathway.
  • operon
  • repressor
  • inducer
  • promoter
The operon model of the regulation of gene expression in bacteria was proposed by _____.
  • genes of an operon
  • Jacob and Monod
  • regulatory genes
  • initiator and operator
A(n) _____ is a specific small molecule that binds to a bacterial repressor protein and changes its shape so that it cannot bind to an operator, thus switching an operon on.
  • inducer
  • promoter
  • repressor
  • regulatory genes
In the presence of a regulatory protein the lac operon is _____.
  • RNA polymerase
  • not transcribed
  • Jacob and Monod
  • not bound to lactose
Regulatory proteins bind to _____.
  • initiator
  • lactose absent
  • the operator
  • operator
AraC acts as _____ if a mutation prevents arabinose from binding to AraC.
  • operator
  • repressor
  • activator
  • initiator
A(n) _____ is a protein that inhibits gene transcription. In bacteria, this protein binds to the DNA in or near the promoter.
  • promoter
  • inducer
  • operon
  • repressor
The lac repressor protein binds to the operator when it is ______.
  • genes of an operon
  • not bound to lactose
  • Jacob and Monod
  • initiator and operator
AraC binds to _____ in the presence of arabinose.
  • initiator and operator
  • initiator
  • operator
  • repressor
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