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MCQs

Total Questions : 107 | Page 5 of 11 pages
Question 41. Which of the following is false?
  1.    The stability of an RNA-DNA hybrid is generally intermediate between that of RNA and DNA
  2.    RNA duplexes are more stable than DNA duplexes
  3.    DNA duplexes are more stable than RNA duplexes
  4.    DNA duplexes are less stable than RNA- DNA hybrid
 Discuss Question
Answer: Option C. -> DNA duplexes are more stable than RNA duplexes
Answer: (c).DNA duplexes are more stable than RNA duplexes
Question 42. The largest individual molecules known are
  1.    DNA
  2.    protein
  3.    vitamins
  4.    enzymes
 Discuss Question
Answer: Option A. -> DNA
Answer: (a).DNA
Question 43. A nucleotide has component
  1.    pentose sugar
  2.    nitrogenous base
  3.    phosphate group
  4.    all of above
 Discuss Question
Answer: Option D. -> all of above
Answer: (d).all of above
Question 44. The substructure consisting of a nucleobase and sugar is termed as
  1.    nucleotide
  2.    nucleoside
  3.    DNA
  4.    RNA
 Discuss Question
Answer: Option B. -> nucleoside
Answer: (b).nucleoside
Question 45. The main function of nucleic acid is to
  1.    encoding of genetic information
  2.    transmission of genetic information
  3.    expression of genetic information
  4.    all of above
 Discuss Question
Answer: Option D. -> all of above
Answer: (d).all of above
Question 46. Nucleic acids were first discovered within nucleus of
  1.    prokaryotic cells
  2.    bacteria
  3.    eukaryotic cells
  4.    mitochondria
 Discuss Question
Answer: Option C. -> eukaryotic cells
Answer: (c).eukaryotic cells
Question 47. A purine with an amine (NH₂) group on the 6th carbon is
  1.    adenine
  2.    cytosine
  3.    thymine
  4.    guanine
 Discuss Question
Answer: Option A. -> adenine
Answer: (a).adenine
Question 48. Which of the following is found on RNA but not DNA?
  1.    Uracil
  2.    Deoxyribose
  3.    Phosphate
  4.    Adenine
 Discuss Question
Answer: Option A. -> Uracil
Answer: (a).Uracil
Question 49. The most stabilizing force for nucleic acids is
  1.    hydrogen bonds
  2.    electrostatic bond
  3.    Van der Waals
  4.    conformational entropy
 Discuss Question
Answer: Option C. -> Van der Waals
Answer: (c).Van der Waals
Question 50. The unfavourable free energy associated with not satisfying a hydrogen bond after formation of the double helix is approximately
  1.    10 kJ/mol
  2.    20 kJ/mol
  3.    25 kJ/mol
  4.    30 kJ/mol
 Discuss Question
Answer: Option B. -> 20 kJ/mol
Answer: (b).20 kJ/mol

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