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MCQs

Total Questions : 108 | Page 4 of 11 pages
Question 31. . The nucleosome consists of histone
  1.    octamer and 146 bp of DNA
  2.    tetramer and 146 bp of DNA
  3.    hexamer and 146 bp of DNA
  4.    none of the above
 Discuss Question
Answer: Option A. -> octamer and 146 bp of DNA
Question 32. . Klenow fragment without free nucleotides exhibits
  1.    exonuclease activity
  2.    endonuclease activity
  3.    nickase activity
  4.    no activity
 Discuss Question
Answer: Option A. -> exonuclease activity
Question 33. . What is the main damaging effect of UV radiation on DNA?
  1.    Depurination
  2.    Formation of thymine dimers
  3.    Single strand break
  4.    Dehydration
 Discuss Question
Answer: Option B. -> Formation of thymine dimers
Question 34. . DNA helicase is used to
  1.    unwind the double helix
  2.    interact the double helix closely
  3.    break a phosphodiester bond in DNA strand
  4.    none of the above
 Discuss Question
Answer: Option A. -> unwind the double helix
Question 35. . The higher order structure of DNA shows symmetry, whereas the higher order structures of most proteins do not. Why isn't protein shape more regular like DNA?
  1.    DNA has one main function in cells whereas proteins have many.
  2.    The many different amino acid R groups on proteins confer many different shapes.
  3.    Some S amino acids cause proteins to bend; others cause protein to flatten.
  4.    All of the above
 Discuss Question
Answer: Option D. -> All of the above
Question 36. . Okazaki fragments occur during
  1.    transformation
  2.    replication
  3.    polymerase reaction
  4.    synthesis
 Discuss Question
Answer: Option B. -> replication
Question 37. . In sperm heads, DNA is particularly highly condensed and the histones are replaced with small basic protein called
  1.    protamines
  2.    purines
  3.    pyrimidines
  4.    all of the above
 Discuss Question
Answer: Option A. -> protamines
Question 38. . E.coli DNA polymerases II and III lack
  1.    5' → 3' exonuclease activity
  2.    5' → 3' endonuclease activity
  3.    partially 5' → 3' exonuclease activity
  4.    partially 5' → 3' endonuclease activity
 Discuss Question
Answer: Option A. -> 5' → 3' exonuclease activity
Question 39. . Each replication bubbles consists of
  1.    3 replication forks
  2.    2 replication forks
  3.    4 replication forks
  4.    1 replication forks
 Discuss Question
Answer: Option B. -> 2 replication forks
Question 40. . 
In DNA replication, one new strand is synthesized complementary to an old (parent) strand and is referred as
  1.    mutational
  2.    semiconservative
  3.    discontinuous
  4.    antiparallel
 Discuss Question
Answer: Option B. -> semiconservative

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