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MCQs

Total Questions : 107 | Page 10 of 11 pages
Question 91.  The sugar in RNA is __________ , the sugar in DNA is __________
  1.    deoxyribose, ribose
  2.    ribose, deoxyribose
  3.    ribose, phosphate
  4.    ribose, uracil
 Discuss Question
Answer: Option B. -> ribose, deoxyribose
Question 92.  In gel electrophoresis, what fragments will move most quickly through a gel?
  1.    Large fragments
  2.    Small fragments
  3.    Large genome
  4.    None of these
 Discuss Question
Answer: Option B. -> Small fragments
Question 93.  Which pyrimidine base contains an amino group at carbon 4?
  1.    Cytosine
  2.    Thymine
  3.    Uracil
  4.    Adenine
 Discuss Question
Answer: Option A. -> Cytosine
Question 94.  Nucleoside is a pyrimidine or purine base
  1.    covalently bonded to a sugar
  2.    ionically bonded to a sugar
  3.    hydrogen bonded to a sugar
  4.    none of the above
 Discuss Question
Answer: Option A. -> covalently bonded to a sugar
Question 95.  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 96.  The glycosidic bonds in DNA and RNA
  1.    connect the sugar to the base
  2.    can be hydrolyzed by OH- ion
  3.    stabilize Watson-Crick H-bonds
  4.    are free to rotate over about 180°
 Discuss Question
Answer: Option A. -> connect the sugar to the base
Question 97.  Thymidine
  1.    can participate in hydrophobic interactions due to its methyl group
  2.    is replaced by uracil in RNA
  3.    normally forms two hydrogen bonds with adenosine
  4.    all of the above
 Discuss Question
Answer: Option D. -> all of the above
Question 98.  Nucleic acids can be analyzed experimentally by their
  1.    molecular weight
  2.    absorption of visible light
  3.    absorption of uv light
  4.    none of these
 Discuss Question
Answer: Option C. -> absorption of uv light
Question 99. . A nucleotide consists of
  1.    a sugar, a base and a phosphate
  2.    a sugar and a phosphate
  3.    paired bases
  4.    a sugar, a base and three phosphates
 Discuss Question
Answer: Option A. -> a sugar, a base and a phosphate
Question 100. . 
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

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