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MCQs

Total Questions : 282 | Page 8 of 29 pages
Question 71. To which class of transcription factor do nuclear receptors belong?
  1.    Zinc finger proteins
  2.    Leucine zipper proteins
  3.    Helix-turn-helix proteins
  4.    Helix-loop-helix proteins
 Discuss Question
Answer: Option A. -> Zinc finger proteins
Answer: (a).Zinc finger proteins
Question 72. Which of the following statements is not correct?
  1.    Bacteria possess only one type of RNA polymerase
  2.    Attenuation is a regulatory process used by bacteria to control the initiation of transcription
  3.    Repressor binds to operator
  4.    Bacterial genes are polycistronic
 Discuss Question
Answer: Option B. -> Attenuation is a regulatory process used by bacteria to control the initiation of transcription
Answer: (b).Attenuation is a regulatory process used by bacteria to control the initiation of transcription
Question 73. Which of the following bacterial operon is not controlled by attenuation?
  1.    Arabinose
  2.    Tryptophan
  3.    Leucine
  4.    Histidine
 Discuss Question
Answer: Option A. -> Arabinose
Answer: (a).Arabinose
Question 74. Which of the following is the most appropriate definition of an operator?
  1.    A non-coding, regulatory DNA sequence that is bound by RNA polymerase
  2.    A non-coding, regulatory DNA sequence that is bound by a repressor protein
  3.    A DNA-binding protein that regulates gene expression
  4.    A cluster of genes that are regulated by a single promoter
 Discuss Question
Answer: Option B. -> A non-coding, regulatory DNA sequence that is bound by a repressor protein
Answer: (b).A non-coding, regulatory DNA sequence that is bound by a repressor protein
Question 75. Which of the following statements about lac operon in e.coli is true?
  1.    Promoter is the binding site for the lac repressor
  2.    Operon is only switched on in the absence of lactose in the growth medium
  3.    β-galactosidase is only produced in large quantities when the lac repressor is bound to the operator
  4.    Lac operon mRNA is a polycistronic mRNA
 Discuss Question
Answer: Option D. -> Lac operon mRNA is a polycistronic mRNA
Answer: (d).Lac operon mRNA is a polycistronic mRNA
Question 76. CAP is
  1.    Catabolite gene activator protein
  2.    Catabolite gene repressor protein
  3.    Anabolite gene activator protein
  4.    Anabolite gene repressor protein
 Discuss Question
Answer: Option A. -> Catabolite gene activator protein
Answer: (a).Catabolite gene activator protein
Question 77. Formation of the attenuator stem-and-loop structure depends on the events that occur during translation of
  1.    Regulatory sequence 1
  2.    Regulatory sequence 2
  3.    Regulatory sequence 3
  4.    Regulatory sequence 4
 Discuss Question
Answer: Option A. -> Regulatory sequence 1
Answer: (a).Regulatory sequence 1
Question 78. Attenuator sequences base-pair to form a stem-and-loop structure rich in
  1.    A = T
  2.    G ≡ C
  3.    A = C
  4.    G = C
 Discuss Question
Answer: Option B. -> G ≡ C
Answer: (b).G ≡ C
Question 79. Which of the following regulatory sequence allows transcription to continue?
  1.    Sequence 1
  2.    Sequence 2
  3.    Sequence 3
  4.    Sequence 4
 Discuss Question
Answer: Option B. -> Sequence 2
Answer: (b).Sequence 2
Question 80. Trp repressor is a
  1.    Homodimer
  2.    Homotrimer
  3.    Heterodimer
  4.    Heterotrimer
 Discuss Question
Answer: Option A. -> Homodimer
Answer: (a).Homodimer

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