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MCQs

Total Questions : 107 | Page 8 of 11 pages
Question 71. Because DNA is a highly charged polyanion, its stability to heat denaturation
  1.    is independent of G - C content
  2.    increases with increasing salt
  3.    decreases with increasing salt
  4.    does not depend on hydrophobic interactions
 Discuss Question
Answer: Option B. -> increases with increasing salt
Question 72. Nucleic acids can be analyzed experimentally by their
  1.    none of these
  2.    absorption of visible light
  3.    molecular weight
  4.    absorption of uv light
 Discuss Question
Answer: Option D. -> absorption of uv light
Question 73. Nucleotide bases and aromatic amino acids absorb light respectively at
  1.    280 and 260 nm
  2.    260 and 280 nm
  3.    270 and 280 nm
  4.    260 and 270 nm
 Discuss Question
Answer: Option B. -> 260 and 280 nm
Question 74. A nucleotide consists of
  1.    a sugar and a phosphate
  2.    a sugar, a base and a phosphate
  3.    paired bases
  4.    a sugar, a base and three phosphates
 Discuss Question
Answer: Option B. -> a sugar, a base and a phosphate
Question 75. The glycosidic bonds in DNA and RNA
  1.    are free to rotate over about 180°
  2.    connect the sugar to the base
  3.    can be hydrolyzed by OH- ion
  4.    stabilize Watson-Crick H-bonds
 Discuss Question
Answer: Option B. -> connect the sugar to the base
Question 76. Thymidine
  1.    normally forms two hydrogen bonds with adenosine
  2.    is replaced by uracil in RNA
  3.    can participate in hydrophobic interactions due to its methyl group
  4.    All of these
 Discuss Question
Answer: Option D. -> All of these
Question 77. A five carbon sugar lacking a hydrogen at the number 2 carbon is found in
  1.    rDNA
  2.    RNA
  3.    mRNA
  4.    DNA
 Discuss Question
Answer: Option D. -> DNA
Question 78. The unfavourable free energy associated with not satisfying a hydrogen bond after formation of the double helix is approximately
  1.    30 kJ/mol
  2.    20 kJ/mol
  3.    10 kJ/mol
  4.    25 kJ/mol
 Discuss Question
Answer: Option B. -> 20 kJ/mol
Question 79. A purine with an amine (NH2) group on the 6th carbon is
  1.    cytosine
  2.    guanine
  3.    adenine
  4.    thymine
 Discuss Question
Answer: Option C. -> adenine
Question 80. Which of the following is found on RNA but not DNA?
  1.    Adenine
  2.    Uracil
  3.    Deoxyribose
  4.    Phosphate
 Discuss Question
Answer: Option B. -> Uracil

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