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MCQs

Total Questions : 108 | Page 3 of 11 pages
Question 21. . In the study of one experiment it was found that the value of Tm for DNA is = 40° C. If the cell has 20% GC at the above Tm, then what will be value of 'Tm' if the GC% increases to 60%?
  1.    Remains same
  2.    Increases
  3.    Decreases
  4.    Can not be compared
 Discuss Question
Answer: Option B. -> Increases
Question 22. . A cesium chloride will separate DNA molecules by
  1.    absorption
  2.    resorption
  3.    density
  4.    adhesion
 Discuss Question
Answer: Option C. -> density
Question 23. . Enzymes, responsible for unraveling short segments of DNA is
  1.    DNA polymerase
  2.    helicase
  3.    DNA ligase
  4.    primase
 Discuss Question
Answer: Option B. -> helicase
Question 24. . Which of the following enzyme adds complementary bases during replication?
  1.    Helicase
  2.    Synthesase
  3.    Replicase
  4.    Polymerase
 Discuss Question
Answer: Option D. -> Polymerase
Question 25. . If one cell has AT contents 40%, what will be the percentage of Guanine residue?
  1.    60%
  2.    15%
  3.    30%
  4.    Guanine residue can not be calculated
 Discuss Question
Answer: Option C. -> 30%
Question 26. . Which DNA polymerase removes RNA primers in DNA synthesis?
  1.    Polymerase I
  2.    Polymerase II
  3.    Polymerase III
  4.    none of these
 Discuss Question
Answer: Option A. -> Polymerase I
Question 27. . Which of the following would not contain DNA?
  1.    Yeast
  2.    Bacteria
  3.    Glass crystals
  4.    Mold
 Discuss Question
Answer: Option C. -> Glass crystals
Question 28. . Enzyme, responsible for proofreading base pairing is
  1.    DNA polymerase
  2.    Telomerase
  3.    Primase
  4.    DNA ligase
 Discuss Question
Answer: Option A. -> DNA polymerase
Question 29. . Proteins involved in opening a replication bubble are
  1.    DNA helicases
  2.    single stranded binding proteins
  3.    ligase
  4.    DNA topoisomerase
 Discuss Question
Answer: Option D. -> DNA topoisomerase
Question 30. . What bands will be observed in a cesium chloride gradient after two rounds of replication?
  1.    One light, one medium and one heavy band
  2.    One light and one medium band
  3.    One medium band
  4.    One medium and one heavy band
 Discuss Question
Answer: Option B. -> One light and one medium band

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