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MCQs

Total Questions : 101 | Page 2 of 11 pages
Question 11. In DNA, there are
  1.    three bases known as adenine, guanine and cytosine
  2.    only two bases known as adenine and cytosine
  3.    five bases known as adenine, guanine, thymine, tryptophan and cytosine
  4.    four bases known as adenine, guanine, thymine and cytosine
 Discuss Question
Answer: Option D. -> four bases known as adenine, guanine, thymine and cytosine
Question 12. DNA gyrase in E. coli
  1.    is required only at the oriC site
  2.    can be inhibited with antibiotics
  3.    adds positive supercoils to chromosomal DNA
  4.    performs the same function as helicase in eukaryotes
 Discuss Question
Answer: Option B. -> can be inhibited with antibiotics
Question 13. In DNA, guanine pairs with
  1.    Thymine
  2.    Cytosine
  3.    Uracil
  4.    Adenine
 Discuss Question
Answer: Option B. -> Cytosine
Question 14. What is the only common methylation in the DNA of eukaryotes?
  1.    Guanosine in ApGpA trinucleotides
  2.    Adenosine in GpA dinucleotides
  3.    None of these
  4.    Cytosine in CpG dinucleotides
 Discuss Question
Answer: Option D. -> Cytosine in CpG dinucleotides
Question 15. DNA replication takes place in which direction?
  1.    3' to 5'
  2.    Randomly
  3.    5 'to 3'
  4.    Vary from organism to organism
 Discuss Question
Answer: Option C. -> 5 'to 3'
Question 16. What is the approximate size (in kb) of the E. coli genome?
  1.    5500 kilobase
  2.    6500 kilobase
  3.    4500 kilobase
  4.    3000 kilobase
 Discuss Question
Answer: Option C. -> 4500 kilobase
Question 17. What is the range of melting point temperatures (Tm) for most DNA molecules?
  1.    70 to 90°C
  2.    80 to l00°C
  3.    50 to 60°C
  4.    60 to 80°C
 Discuss Question
Answer: Option B. -> 80 to l00°C
Question 18. In the study of one experiment it was found that the value of Tm for DNA is = 40° C. If the cell has 20% GC at the above Tm, then what will be value of 'Tm' if the GC% increases to 60%?
  1.    Decreases
  2.    Increases
  3.    Can not be compared
  4.    Remains same
 Discuss Question
Answer: Option B. -> Increases
Question 19. The overall conclusion of the Hershey-Chase experiment was that
  1.    phage DNA was similar to bacterial DNA
  2.    the ratio of Adenine to thymine was always the same
  3.    DNA was responsible for heredity
  4.    proteins and DNA were responsible for heredity
 Discuss Question
Answer: Option C. -> DNA was responsible for heredity
Question 20. DNAs when charged, migrate in a gel towards the
  1.    positive pole
  2.    none of these
  3.    negative pole
  4.    will not migrate
 Discuss Question
Answer: Option A. -> positive pole

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