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MCQs

Total Questions : 369 | Page 4 of 37 pages
Question 31. The type I enzyme(s) is/are
  1.    Topoisomerases I and III
  2.    Topoisomerases II
  3.    Topoisomerase IV
  4.    Topoisomerases I and IV
 Discuss Question
Answer: Option A. -> Topoisomerases I and III
Answer: (a).Topoisomerases I and III
Question 32. The type of topoisomerases that can introduce negative supercoils is
  1.    Type I
  2.    Type II
  3.    Type III
  4.    Type IV
 Discuss Question
Answer: Option B. -> Type II
Answer: (b).Type II
Question 33. The type of topoisomerases which generally relaxes DNA by removing negative supercoiling is
  1.    Type I
  2.    Type II
  3.    Type III
  4.    Type IV
 Discuss Question
Answer: Option A. -> Type I
Answer: (a).Type I
Question 34. Under-winding is measured in terms of
  1.    Supercoiling
  2.    Linking difference
  3.    Positive supercoiling
  4.    Negative supercoiling
 Discuss Question
Answer: Option B. -> Linking difference
Answer: (b).Linking difference
Question 35. Which type of supercoiling takes the form of extended right-handed coils?
  1.    Plectonemic supercoiling
  2.    Solenoidal supercoiling
  3.    Negative supercoiling
  4.    Positive supercoiling
 Discuss Question
Answer: Option A. -> Plectonemic supercoiling
Answer: (a).Plectonemic supercoiling
Question 36. DNA replication is
  1.    Conservative
  2.    Non-conservative
  3.    Semi-conservative
  4.    None of the mentioned
 Discuss Question
Answer: Option C. -> Semi-conservative
Answer: (c).Semi-conservative
Question 37. Eukaryotes differ from prokaryote in mechanism of DNA replication due to
  1.    Use of DNA primer rather than RNA primer
  2.    Different enzyme for synthesis of lagging and leading strand
  3.    Discontinuous rather than semi-discontinuous replication
  4.    Unidirectional rather than semi-discontinuous replication
 Discuss Question
Answer: Option C. -> Discontinuous rather than semi-discontinuous replication
Answer: (c).Discontinuous rather than semi-discontinuous replication
Question 38. Semi-conservative DNA replication was first demonstrated in
  1.    Drosophila melanogaster
  2.    Escherichia coli
  3.    Streptococcus pneumonae
  4.    Drosophila melanogaster
 Discuss Question
Answer: Option D. -> Drosophila melanogaster
Answer: (d).Drosophila melanogaster
Question 39. The reaction in DNA replication catalyzed by DNA ligase is
  1.    Addition of new nucleotides to the leading strand
  2.    Addition of new nucleotide to the lagging strand
  3.    Formation of a phosphodiester bond between the 3’-OH of one Okazaki fragment and the 5’-phosphate of the next on the lagging strand
  4.    Base pairing of the template and the newly formed DNA strand
 Discuss Question
Answer: Option C. -> Formation of a phosphodiester bond between the 3’-OH of one Okazaki fragment and the 5’-phosphate of the next on the lagging strand
Answer: (c).Formation of a phosphodiester bond between the 3’-OH of one Okazaki fragment and the 5’-phosphate of the next on the lagging strand
Question 40. Which of the following is true about DNA polymerase?
  1.    It can synthesize DNA in the 5’ to 3’ direction
  2.    It can synthesize DNA in the 3’ to 5’ direction
  3.    It can synthesize mRNA in the 3’ to 5’ direction
  4.    It can synthesize mRNA in the 5’ to 3’ direction
 Discuss Question
Answer: Option A. -> It can synthesize DNA in the 5’ to 3’ direction
Answer: (a).It can synthesize DNA in the 5’ to 3’ direction

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