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MCQs

Total Questions : 241 | Page 20 of 25 pages
Question 191. All viruses replicate in DNA , except
  1.    Poxviruses
  2.    HIV
  3.    HBV
  4.    HCV
 Discuss Question
Answer: Option A. -> Poxviruses
Answer: (a).Poxviruses
Question 192. 'Poxviruses' replicates in
  1.    Vacuole
  2.    Cytoplasm
  3.    Nucleus
  4.    Mitochondria
 Discuss Question
Answer: Option B. -> Cytoplasm
Answer: (b).Cytoplasm
Question 193. Which of the following possesses both 5'-3' and 3'-5' exonuclease activity?
  1.    Kornberg enzyme
  2.    DNA polymerase III
  3.    Taq DNA polymerase
  4.    None of these
 Discuss Question
Answer: Option A. -> Kornberg enzyme
Answer: (a).Kornberg enzyme
Question 194. Which of the following statements on replication in E.coli is correct?
  1.    It occurs in a unidirectional manner
  2.    It occurs in bidirectional manner
  3.    Always uses T7 DNA polymerase when infected by T7 phage
  4.    Occurs only when λ phase has infected E. coli
 Discuss Question
Answer: Option B. -> It occurs in bidirectional manner
Answer: (b).It occurs in bidirectional manner
Question 195. The replication of chromosomes by eukaryotes occurs in a relatively short period of time because
  1.    the eukaryotes have more amount of DNA for replication
  2.    the eukaryotic replication machinery is 1000 times faster than the prokaryotes
  3.    each chromosome contains multiple replicons
  4.    eukaryotic DNA is always single stranded
 Discuss Question
Answer: Option C. -> each chromosome contains multiple replicons
Answer: (c).each chromosome contains multiple replicons
Question 196. In E.coli, which enzyme synthesizes the RNA primer for Okazaki fragments?
  1.    DnaA
  2.    DnaC
  3.    DnaG
  4.    all of these
 Discuss Question
Answer: Option C. -> DnaG
Answer: (c).DnaG
Question 197. During which of the following process a new copy of a DNA molecule is precisely synthesized?
  1.    Trasformation
  2.    Transcription
  3.    Translation
  4.    Replication
 Discuss Question
Answer: Option D. -> Replication
Answer: (d).Replication
Question 198. DNA gyrase is inhibited by
  1.    tetracycline
  2.    nalidixic acid
  3.    both (a) and (b)
  4.    cephalosporin
 Discuss Question
Answer: Option B. -> nalidixic acid
Answer: (b).nalidixic acid
Question 199. Which of the following enzymes unwind short stretches of DNA helix immediately ahead of a replication fork?
  1.    DNA polymerases
  2.    Helicases
  3.    Single-stranded binding proteins
  4.    Topoisomerases
 Discuss Question
Answer: Option B. -> Helicases
Answer: (b).Helicases
Question 200. During DNA replication in prokaryotes, synthesis begins on the circular chromosome
  1.    always at the same place
  2.    at any stretch of DNA that is high in AT pairs
  3.    randomly on the chromosome
  4.    at the promoter
 Discuss Question
Answer: Option A. -> always at the same place
Answer: (a).always at the same place

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