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MCQs

Total Questions : 108 | Page 2 of 11 pages
Question 11. . In DNA, there are
  1.    five bases known as adenine, guanine, thymine, tryptophan and cytosine
  2.    four bases known as adenine, guanine, thymine and cytosine
  3.    three bases known as adenine, guanine and cytosine
  4.    only two bases known as adenine and cytosine
 Discuss Question
Answer: Option B. -> four bases known as adenine, guanine, thymine and cytosine
Question 12. . DNA replication takes place in which direction?
  1.    3' to 5'
  2.    5 'to 3'
  3.    Randomly
  4.    Vary from organism to organism
 Discuss Question
Answer: Option B. -> 5 'to 3'
Question 13. . DNA gyrase in E. coli
  1.    adds positive supercoils to chromosomal DNA
  2.    can be inhibited with antibiotics
  3.    is required only at the oriC site
  4.    performs the same function as helicase in eukaryotes
 Discuss Question
Answer: Option B. -> can be inhibited with antibiotics
Question 14. . In DNA, guanine pairs with
  1.    Adenine
  2.    Cytosine
  3.    Thymine
  4.    Uracil
 Discuss Question
Answer: Option B. -> Cytosine
Question 15. . Which of the following is incorrect?
  1.    In DNA double helix, two strands of the DNA are bound with each other with the bases
  2.    Adenine always pairs with thymine
  3.    Guanine always pairs with the cytosine
  4.    None of the above
 Discuss Question
Answer: Option D. -> None of the above
Question 16. . DNAs when charged, migrate in a gel towards the
  1.    positive pole
  2.    negative pole
  3.    will not migrate
  4.    none of these
 Discuss Question
Answer: Option A. -> positive pole
Question 17. . What is the only common methylation in the DNA of eukaryotes?
  1.    Adenosine in GpA dinucleotides
  2.    Guanosine in ApGpA trinucleotides
  3.    Cytosine in CpG dinucleotides
  4.    None of the above
 Discuss Question
Answer: Option C. -> Cytosine in CpG dinucleotides
Question 18. . What is the approximate size (in kb) of the E. coli genome?
  1.    3000 kilobase
  2.    4500 kilobase
  3.    5500 kilobase
  4.    6500 kilobase
 Discuss Question
Answer: Option B. -> 4500 kilobase
Question 19. . What is the range of melting point temperatures (Tm) for most DNA molecules?
  1.    50 to 60°C
  2.    60 to 80°C
  3.    70 to 90°C
  4.    80 to l00°C
 Discuss Question
Answer: Option D. -> 80 to l00°C
Question 20. . The overall conclusion of the Hershey-Chase experiment was that
  1.    DNA was responsible for heredity
  2.    proteins and DNA were responsible for heredity
  3.    the ratio of Adenine to thymine was always the same
  4.    phage DNA was similar to bacterial DNA
 Discuss Question
Answer: Option A. -> DNA was responsible for heredity

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