AP Biology Chapter 18 part 1
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  • Question 1
    30 seconds
    Q. what is an operon?
    answer choices
    a part of a ribsome
    a part of a Rna
    a unit made up of linked genes that code for proteins needed to do a specific task
    needed for dna replication
  • Question 2
    30 seconds
    Q. A protein that binds to the operator and blocks the RNA polymerase
    answer choices
    regulator
    repressor
    activator
    corepressor
  • Question 3
    30 seconds
    Q. The "on/off" switch for an operon is called the
    answer choices
    promoter
    repressor
    operator
    gene
  • Question 4
    30 seconds
    Q. What is the name of the stretch of DNA where RNA polymerase binds?
    answer choices
    operator
    promoter
    enhancer
    origin
  • Question 5
    60 seconds
    Q. What is the role of operons in prokaryote gene expression?
    answer choices
    It makes the genes prokaryotes be turned on
    It accounts for the regulation of gene activity in response to the needs of the cells
    To make DNA for the gene
    To make the gene turn of and off
  • Question 6
    60 seconds
    Q. The lac operon genes only become expressed if:
    answer choices
    lactose binds to the repressor
    glucose binds to the repressor
    lactose binds to the operator
    the repressor binds to the operator
  • Question 7
    30 seconds
    Q. In the lac operon model the genes within the operon will be expressed if:
    answer choices
    lactose is absent in the cell
    glucose is present in the cell
    lactose is present in the cell
  • Question 8
    30 seconds
    Q. Inducible negative control is when when the gene is transcribed by the ____ of a specific molecule
    answer choices
    presence
    absence
  • Question 9
    30 seconds
    Q. Repressible negative control is when when the gene is transcribed by the ____ of a specific molecule
    answer choices
    presence
    absence
  • Question 10
    30 seconds
    Q. What type of operon is the trp (tryptophan) operon?
    answer choices
    inducible
    repressible
    positive control
    promoible
  • Question 11
    30 seconds
    Q. Operons are found in the cells of which of the following types of organisms?
    answer choices
    prokaryotes (bacteria)
    eukaryotes (plant and animals)
    animals only
    viruses
  • Question 12
    30 seconds
    Q. How can a person's muscle cells have the same exact DNA sequences as their nerve cells even though the look and perform completely different?
    answer choices
    The two different cells become mutated
    The proteins expressed in each cell are different
    They actually have different DNA in the two types of cells.
    The genome of the different cells changes
  • Question 13
    30 seconds
    Q.

    lac operon was proposed by

    answer choices

    Meselson and Stahl

    Jacob and Monod

    Hershey and Chase

    Watson and Crick

  • Question 14
    30 seconds
    Q.

    The regulation of an operon by repressor is referred to as

    answer choices

    negative regulation

    positive regulation

    both a and b

    neutral regulation

  • Question 15
    30 seconds
    Q.

    In the lac operon the inducer is

    answer choices

    allolactose

    glucose

    galactose

    all of the above

  • Question 16
    30 seconds
    Q. Most gene regulation happens at which step along the way?
    answer choices
    translation
    transcription
    signal transduction
    DNA replication
  • Question 17
    30 seconds
    Q.

    For a repressible operon to be transcribed, which of the following must be true?

    answer choices

    A corepressor must be present.

    RNA polymerase and the active repressor must be present.

    RNA polymerase must bind to the promoter, and the repressor must be inactive and not blocking the promoter region.

    RNA polymerase cannot be present, and the repressor must be inactive.

  • Question 18
    30 seconds
    Q.

    Which of the following statements regarding the trp operon is true?

    answer choices

    The operator region produces the mRNA that codes for the repressor.

    The regulatory gene is not transcribed in the presence of the repressor.

    Repressor proteins are inactivated by the presence of the repressor. .

    The trp operon is always activated unless deactivated by a repressor

  • Question 19
    30 seconds
    Q.

    Why is the transcription of structural genes of the trp operon turned off in the presence of tryptophan?

    answer choices

    Tryptophan is the repressor that binds to the operator, preventing transcription.

    The structural genes are used to make tryptophan, which would not be needed if tryptophan is available.

    Tryptophan has no effect on the transcription of the structural genes.

    Tryptophan RNA polymerase from finding the promoter of the trp operon, preventing structural gene transcription.

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