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MCQs

Total Questions : 241 | Page 21 of 25 pages
Question 201. DNA replication rates in prokaryotes are approximately of the order of
  1.    10 bases per second
  2.    1,00 bases per second
  3.    1,000 bases per second
  4.    10,000 bases per second
 Discuss Question
Answer: Option C. -> 1,000 bases per second
Answer: (c).1,000 bases per second
Question 202. Which of the following lacks 3'-5' exonuclease activity?
  1.    Short fragment of DNA polymerase I
  2.    Taq DNA polymerase
  3.    T4 DNA ligase
  4.    All of the above
 Discuss Question
Answer: Option D. -> All of the above
Answer: (d).All of the above
Question 203. What is the direct cause of cell death by diphtheria toxin?
  1.    Formation of an ion channel in the cell membrane
  2.    Inactivation of a translational elongation factor
  3.    Induction of apoptosis
  4.    None of the above
 Discuss Question
Answer: Option B. -> Inactivation of a translational elongation factor
Answer: (b).Inactivation of a translational elongation factor
Question 204. The interaction between the mRNA and tRNA determined the position of amino acid in a polypeptide sequence. This is called the
  1.    stagerivity
  2.    Wobble hypothesis
  3.    promiscuity
  4.    adaptor hypothesis
 Discuss Question
Answer: Option D. -> adaptor hypothesis
Answer: (d).adaptor hypothesis
Question 205. What are the Svedberg values for the subunits of the 70S ribosomes of E. colli?
  1.    40S and 30S
  2.    50S and 20S
  3.    50S and 30S
  4.    40S and 20S
 Discuss Question
Answer: Option C. -> 50S and 30S
Answer: (c).50S and 30S
Question 206. What is the maximum number of different amino acids in a polypeptide chain coded by the synthetic polyribonucleotides (UCAG)5?
  1.    One
  2.    Two
  3.    Three
  4.    Four
 Discuss Question
Answer: Option C. -> Three
Answer: (c).Three
Question 207. The development of global regulatory systems in prokaryotes
  1.    determines the exact location of the cell on the globe
  2.    aids in DNA replication
  3.    determines the exact location of the replication site
  4.    regulates many genes under varying environmental conditions
 Discuss Question
Answer: Option D. -> regulates many genes under varying environmental conditions
Answer: (d).regulates many genes under varying environmental conditions
Question 208. Why the bacterium Treponema pallidum is difficult to culture?
  1.    Because it requires a great deal of water to reproduce
  2.    Because it lacks the genes needed for TCA cycle and oxidative phosphorylation
  3.    Because it is unable to use carbohydrates as an energy source
  4.    Because it requires extremely low temperature at which water freezes
 Discuss Question
Answer: Option B. -> Because it lacks the genes needed for TCA cycle and oxidative phosphorylation
Question 209. In the time since E. coli and Salmonella diverged evolutionarily
  1.    none of these
  2.    E. coli has acquired many genes via horizontal transfer
  3.    E, coli has lost approximately 50% of its genome
  4.    there has been little change in either genome
 Discuss Question
Answer: Option C. -> E, coli has lost approximately 50% of its genome
Question 210. The physical nature of genomes is studied under
  1.    comparative genomics
  2.    structural genomics
  3.    functional genomics
  4.    proteo genomics
 Discuss Question
Answer: Option B. -> structural genomics

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