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MCQs

Total Questions : 133 | Page 4 of 14 pages
Question 31. Which bond is used to stabilize the double helix of DNA?
  1.    Hydrophobic bond
  2.    Hydrogen bond
  3.    Covalent bond
  4.    Ionic bond
 Discuss Question
Answer: Option B. -> Hydrogen bond
Answer: (b).Hydrogen bond
Question 32. A purified DNA sample of leaf contains 20.0 mole of guanine. Calculate the approximate percentage of purine residues?
  1.    30%
  2.    40%
  3.    60%
  4.    20%
 Discuss Question
Answer: Option A. -> 30%
Answer: (a).30%
Question 33. Who described the structure of DNA double helix?
  1.    Peter Mitchell
  2.    Andre Jagendorf
  3.    Ernest Uribe
  4.    Watson and Crick
 Discuss Question
Answer: Option D. -> Watson and Crick
Answer: (d).Watson and Crick
Question 34. Which form of DNA is described by Watson-Crick model?
  1.    B-DNA
  2.    Z-DNA
  3.    A-DNA
  4.    Quadraplex DNA
 Discuss Question
Answer: Option A. -> B-DNA
Answer: (a).B-DNA
Question 35. Name the nitrogenous base which is found in abundance in G-quadruplex?
  1.    Adenine
  2.    Guanine
  3.    Cytosine
  4.    Thymine
 Discuss Question
Answer: Option B. -> Guanine
Answer: (b).Guanine
Question 36. The third strand of triple helix is paired in which scheme?
  1.    Hoogsteen base pair scheme
  2.    Intermolecular base pair scheme
  3.    Intramolecular base pair scheme
  4.    G-quartet scheme
 Discuss Question
Answer: Option A. -> Hoogsteen base pair scheme
Answer: (a).Hoogsteen base pair scheme
Question 37. How many base pairs are there in every helical turn of Watson-Crick double helix model?
  1.    32.3
  2.    11.6
  3.    20
  4.    10.4
 Discuss Question
Answer: Option D. -> 10.4
Answer: (d).10.4
Question 38. Which one of the following statement is INCORRECT for Z-DNA?
  1.    Left-handed DNA
  2.    Mostly found in alternating purine-pyrimidine sequences
  3.    Only one deep, narrow groove
  4.    Anti glycosidic bond conformation
 Discuss Question
Answer: Option D. -> Anti glycosidic bond conformation
Answer: (d).Anti glycosidic bond conformation
Question 39. The stability and formation of G-quadruplex depends on __________
  1.    Monovalent cation
  2.    Divalent cation
  3.    Bivalent cation
  4.    Pentavalent ion
 Discuss Question
Answer: Option A. -> Monovalent cation
Answer: (a).Monovalent cation
Question 40. Double-stranded DNA with high GC content has higher thermal stability than that of lower GC content?
  1.    True
  2.    False
  3.    May be True or False
  4.    Can't say
 Discuss Question
Answer: Option A. -> True
Answer: (a).True

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