Regulation of Gene Expression in Prokaryotes MCQ

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• Which of the following encodes recombinase?
  ক

  fliC

  খ

  fljB

  গ

  hin

  ঘ

  fljA
• When DNA segment is in one orientation ____________
  ক

  The gene for FljB and gene encoding FljA are expressed

  খ

  The gene for FliC are expressed

  গ

  The gene for FljB and gene encoding FljA are not expressed

  ঘ

  The gene for FljB and gene encoding FljC are not expressed
• Whose interaction with Lex-A facilitates the repressor’s self-cleavage reaction?
  ক

  Rec-A

  খ

  Rec-B

  গ

  Rec-C

  ঘ

  Rec-D
• Which of the following takes place when tryptophan levels are high?
  ক

  Attenuation at the attenuator structure formed by sequences of 3 and 4

  খ

  Ribosomes pauses at the Try codons in sequence 1

  গ

  Formation of paired structure between 2 and 3 sequences prevents attenuation

  ঘ

  2:3 structures, unlike the 3:4 attenuator, does not prevent transcription
• Which of the following takes place when tryptophan levels are low?
  ক

  Ribosomes quickly translates sequence 1

  খ

  Sequence 2 is blocked before sequence 3 is transcribed

  গ

  Ribosomes pauses at the Try codons in sequence 1

  ঘ

  Attenuation at the attenuator structure formed by sequences of 3 and 4
• Formation of the attenuator stem-and-loop structure depends on the events that occur during translation of ____________
  ক

  Regulatory sequence 1

  খ

  Regulatory sequence 2

  গ

  Regulatory sequence 3

  ঘ

  Regulatory sequence 4
• Attenuator sequences base-pair to form a stem-and-loop structure rich in ____________
  ক

  A = T

  খ

  G ≡ C

  গ

  A = C

  ঘ

  G = C
• Trp repressor is a ____________
  ক

  Homodimer

  খ

  Homotrimer

  গ

  Heterodimer

  ঘ

  Heterotrimer
• CAP is ____________
  ক

  Catabolite gene activator protein

  খ

  Catabolite gene repressor protein

  গ

  Anabolite gene activator protein

  ঘ

  Anabolite gene repressor protein