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MCQs

Total Questions : 47 | Page 3 of 5 pages
Question 21. Why are several structural genes regulated as a unit in bacteria?
  1.    None of these
  2.    An accident of evolution
  3.    It allows coordinating regulation of genes with a common function
  4.    The bacteria chromosome is so small; many different genes must be controlled by the same promoter
 Discuss Question
Answer: Option C. -> It allows coordinating regulation of genes with a common function
Question 22. Alternate splicing of RNA transcripts is a mechanism to regulate
  1.    tachykinins
  2.    tubulin
  3.    leucine zippers
  4.    DNA methylation
 Discuss Question
Answer: Option A. -> tachykinins
Question 23.  A mutation in the tip binding site of the repressor would result in
  1.    constitutive trp operon expression
  2.    inducible trp operon expression
  3.    no operon expression
  4.    none of the above
 Discuss Question
Answer: Option A. -> constitutive trp operon expression
Question 24.  Sex lethal (sxl) in Drosophila is transcribed when
  1.    the X autosome balance is less than 0.5
  2.    the X autosome balance is 1 or greater
  3.    the X autosome balance equals 0.5
  4.    none of the above
 Discuss Question
Answer: Option B. -> the X autosome balance is 1 or greater
Question 25.  The first protein complex to bind to the TATA box is
  1.    transcription factor IIA
  2.    transcription factor IIB
  3.    transcription factor IID
  4.    all of these
 Discuss Question
Answer: Option C. -> transcription factor IID
Question 26.  A frameshift mutation occurs in the sigma subunit gene transcribed as part of SPOl early genes. What will be the immediate result?
  1.    Early genes will not be translated
  2.    Middle genes will not be transcribed
  3.    The bacterial host will lyse immediately
  4.    Infection will proceed as usual
 Discuss Question
Answer: Option C. -> The bacterial host will lyse immediately
Question 27.  In the presence of high levels of tryptophan
  1.    attenuator allows transcription of trp structural genes
  2.    attenuator propogates transcription
  3.    attenuator terminates transcription
  4.    none of the above
 Discuss Question
Answer: Option C. -> attenuator terminates transcription
Question 28.  Which of the following is not part of the lac operon?
  1.    I
  2.    O
  3.    P
  4.    none of these
 Discuss Question
Answer: Option A. -> I
Question 29.  The lac operon is transcribed in which segments?
  1.    1
  2.    2
  3.    3
  4.    4
 Discuss Question
Answer: Option A. -> 1
Question 30. . What are genes?
  1.    The functional unit of inheritance
  2.    A fragment of DNA
  3.    A portion of a chromosome
  4.    All of the above
 Discuss Question
Answer: Option D. -> All of the above

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