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MCQs

Total Questions : 107 | Page 3 of 11 pages
Question 21. Identify the purine base of nucleic acids in the following.
  1.    Cytosine
  2.    Thymine
  3.    Uracil
  4.    Adenine
 Discuss Question
Answer: Option D. -> Adenine
Answer: (d).Adenine
Question 22. Which of the following statements is true?
  1.    Sugar component of a nucleotide is ribose
  2.    Sugar component of a nucleotide is deoxyribose
  3.    The bases in nucleotides are attached to a pentose sugar moiety by a glycosidic linkage
  4.    The sugar molecule of the nucleotide is in L-configuration
 Discuss Question
Answer: Option C. -> The bases in nucleotides are attached to a pentose sugar moiety by a glycosidic linkage
Answer: (c).The bases in nucleotides are attached to a pentose sugar moiety by a glycosidic linkage
Question 23. The sugar molecule in a nucleotide is ____________
  1.    Pentose
  2.    Hexose
  3.    Tetrose
  4.    Triose
 Discuss Question
Answer: Option A. -> Pentose
Answer: (a).Pentose
Question 24. What is the composition of nucleoside?
  1.    a sugar + a phosphate
  2.    a base + a sugar
  3.    a base + a phosphate
  4.    a base + a sugar + phosphate
 Discuss Question
Answer: Option B. -> a base + a sugar
Answer: (b).a base + a sugar
Question 25. Group of adjacent nucleotides are joined by ____________
  1.    Phosphodiester bond
  2.    Peptide bond
  3.    Ionic bond
  4.    Covalent bond
 Discuss Question
Answer: Option A. -> Phosphodiester bond
Answer: (a).Phosphodiester bond
Question 26. What is the composition of nucleotide?
  1.    a sugar + a phosphate
  2.    a base + a sugar
  3.    a base + a phosphate
  4.    a base + a sugar + phosphate
 Discuss Question
Answer: Option D. -> a base + a sugar + phosphate
Answer: (d).a base + a sugar + phosphate
Question 27. Which of the following statements is not true about RNA?
  1.    Does not have a double stranded structure
  2.    Thymine is present
  3.    Does not obey Chargaff’s rule
  4.    The sugar contained in RNA is a ribose
 Discuss Question
Answer: Option B. -> Thymine is present
Answer: (b).Thymine is present
Question 28. What happens in hyperchromicity?
  1.    When DNA is in bound form, there is decrease in absorption of UV light
  2.    When DNA is in bound form, there is increase in absorption of UV light
  3.    When DNA is in unbound form, it is more stable
  4.    When DNA is in unbound form, there is increase in absorption of UV light
 Discuss Question
Answer: Option D. -> When DNA is in unbound form, there is increase in absorption of UV light
Answer: (d).When DNA is in unbound form, there is increase in absorption of UV light
Question 29. What happens in hypochromicity?
  1.    When DNA is in bound form, there is decrease in absorption of UV light
  2.    When DNA is in bound form, there is increase in absorption of UV light
  3.    When DNA is in unbound form, it is more stable
  4.    When DNA is in unbound form, there is decrease in absorption of UV light
 Discuss Question
Answer: Option A. -> When DNA is in bound form, there is decrease in absorption of UV light
Answer: (a).When DNA is in bound form, there is decrease in absorption of UV light
Question 30. Which of the following is true about Z-DNA helix?
  1.    It has alternating GC sequences
  2.    It is a permanent conformation of DNA
  3.    It tends to be found at the 3’ end of the genes
  4.    It has fewer base pairs per turn than B-DNA
 Discuss Question
Answer: Option A. -> It has alternating GC sequences
Answer: (a).It has alternating GC sequences

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