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MCQs

Total Questions : 241 | Page 11 of 25 pages
Question 101. Which is not an essential part of a two-component phosphorelay system?
  1.    Response regulator
  2.    Sensor kinase
  3.    Autoinducer
  4.    None of these
 Discuss Question
Answer: Option C. -> Autoinducer
Answer: (c).Autoinducer
Question 102. Stem and loop structures are
  1.    proteins that help partially denatured enzymes to recover their native configuration
  2.    structures in DNA caused by inverted repeats
  3.    structures at the ends of linear eukaryotic DNA molecules
  4.    the bonds between adjacent DNA nucleotides in the same strand
 Discuss Question
Answer: Option B. -> structures in DNA caused by inverted repeats
Answer: (b).structures in DNA caused by inverted repeats
Question 103. Which of the following enzyme is used for synthesis of RNA under the direction of DNA?
  1.    RNA polymerase
  2.    DNA ligase
  3.    DNA polymerase
  4.    RNA ligase
 Discuss Question
Answer: Option A. -> RNA polymerase
Answer: (a).RNA polymerase
Question 104. What is the usual sequence of a Pribnow box?
  1.    AUAUA
  2.    TATAAT
  3.    UUUUU
  4.    TTGACA
 Discuss Question
Answer: Option B. -> TATAAT
Answer: (b).TATAAT
Question 105. Which eukaryotic RNA polymerase makes tRNA's?
  1.    RNA polymerase 1
  2.    RNA polymerase 2
  3.    RNA polymerase 3
  4.    Any of these
 Discuss Question
Answer: Option C. -> RNA polymerase 3
Answer: (c).RNA polymerase 3
Question 106. Which of the following statement defines a replicon?
  1.    A DNA molecule that encodes pili for conjugation
  2.    A DNA molecule that is able to replicate and be maintained
  3.    A DNA template which is used in transcription
  4.    The enzyme responsible for transposition
 Discuss Question
Answer: Option B. -> A DNA molecule that is able to replicate and be maintained
Answer: (b).A DNA molecule that is able to replicate and be maintained
Question 107. Which of the following component of RNA polymerase facilitates the recognition of promoter sequences?
  1.    a subunit
  2.    b subunit
  3.    s subunit
  4.    c subunit
 Discuss Question
Answer: Option C. -> s subunit
Answer: (c).s subunit
Question 108. Genetic variations are
  1.    temporary
  2.    influenced by the environment
  3.    stable
  4.    not heritable
 Discuss Question
Answer: Option C. -> stable
Answer: (c).stable
Question 109. A specific __________ factor helps RNA polymerase bind to late promoters and transcribe late genes.
  1.    sigma
  2.    beta
  3.    delta
  4.    gamma
 Discuss Question
Answer: Option A. -> sigma
Answer: (a).sigma
Question 110. The components found in all prokaryotic transcription terminators is
  1.    a poly-U region
  2.    Rho factor
  3.    a hairpin structure
  4.    none of these
 Discuss Question
Answer: Option C. -> a hairpin structure
Answer: (c).a hairpin structure

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