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MCQs

Total Questions : 95 | Page 3 of 10 pages
Question 21. DNA helix makes one full turn after what distance along its length?
  1.    10 nm
  2.    5 nm
  3.    3.4 nm
  4.    1 nm
 Discuss Question
Answer: Option C. -> 3.4 nm
Answer: (c).3.4 nm
Question 22. What is diameter of DNA double helix in a eukaryotic cell?
  1.    1 nm
  2.    3 nm
  3.    5 nm
  4.    2 nm
 Discuss Question
Answer: Option D. -> 2 nm
Answer: (d).2 nm
Question 23. About how many enzymes participate in DNA replication?
  1.    12
  2.    90
  3.    100
  4.    2
 Discuss Question
Answer: Option A. -> 12
Answer: (a).12
Question 24. Which of following is not a nitrogenous base of DNA?
  1.    alanine
  2.    guanine
  3.    adenine
  4.    cytosine
 Discuss Question
Answer: Option A. -> alanine
Answer: (a).alanine
Question 25. Telomeres undergo which of following changes in each replication round?
  1.    shorten
  2.    elongate
  3.    no change
  4.    fall off
 Discuss Question
Answer: Option A. -> shorten
Answer: (a).shorten
Question 26. Which of following techniques is used by Crick to study protein structure?
  1.    electron microscope
  2.    microscope
  3.    X ray crystallography
  4.    circular dichroism
 Discuss Question
Answer: Option C. -> X ray crystallography
Answer: (c).X ray crystallography
Question 27. How many DNA repair enzymes have been found so far in humans?
  1.    2
  2.    100
  3.    150
  4.    900
 Discuss Question
Answer: Option B. -> 100
Answer: (b).100
Question 28. Which of following is an example of a purine base?
  1.    thymine
  2.    uracil
  3.    adenine
  4.    cytosine
 Discuss Question
Answer: Option C. -> adenine
Answer: (c).adenine
Question 29. Amount of which of following bases is equal to amount Thymine?
  1.    adenine
  2.    uracil
  3.    guanine
  4.    cytosine
 Discuss Question
Answer: Option A. -> adenine
Answer: (a).adenine
Question 30. What is string of DNA between two nucleosomes called?
  1.    attachment DNA
  2.    linker DNA
  3.    pure DNA
  4.    connecting DNA
 Discuss Question
Answer: Option B. -> linker DNA
Answer: (b).linker DNA

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