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MCQs

Total Questions : 107 | Page 2 of 11 pages
Question 11. Nucleic acids were discovered in
  1.    1869
  2.    1870
  3.    1868
  4.    1867
 Discuss Question
Answer: Option C. -> 1868
Answer: (c).1868
Question 12. Which of the following is a purine?
  1.    Cytosine
  2.    Adenine
  3.    Thymine
  4.    Uracil
 Discuss Question
Answer: Option B. -> Adenine
Answer: (b).Adenine
Question 13. 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
Answer: (d).all of the above
Question 14. 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
Answer: (c).absorption of uv light
Question 15. 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
Answer: (a).connect the sugar to the base
Question 16. 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
Answer: (b).260 and 280 nm
Question 17. The type II restriction endonucleases, bind to DNA sites
  1.    using H-bonds for specificity
  2.    that are usually palindromic
  3.    using non-sequence-dependent backbone interactions
  4.    all of the above
 Discuss Question
Answer: Option D. -> all of the above
Answer: (d).all of the above
Question 18. Different DNA polymerases play distinct roles in DNA replication and repair in both prokaryotic and eukaryotic cells. All known DNA polymerases synthesize DNA only in the __________ by the addition of dNTPs to a performed primer strand of DNA.
  1.    positive direction
  2.    3' to 5' direction
  3.    5' to 3' direction
  4.    negative direction
 Discuss Question
Answer: Option C. -> 5' to 3' direction
Answer: (c).5' to 3' direction
Question 19. Which of the following are not the components of RNA?
  1.    Thymine
  2.    Adenine
  3.    Guanine
  4.    Cytosine
 Discuss Question
Answer: Option A. -> Thymine
Answer: (a).Thymine
Question 20. The enzyme that joins DNA cuts is called
  1.    joinase
  2.    ligase
  3.    DNA phosphorylase
  4.    reverse transcriptase
 Discuss Question
Answer: Option B. -> ligase
Answer: (b).ligase

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