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MCQs

Total Questions : 58 | Page 2 of 6 pages
Question 11. What are the Svedberg values for the subunits of the 70S ribosomes of E. colli?
  1.    40S and 30S
  2.    40S and 20S
  3.    50S and 20S
  4.    50S and 30S
 Discuss Question
Answer: Option D. -> 50S and 30S
Question 12. What is the direct cause of cell death by diphtheria toxin?
  1.    Formation of an ion channel in the cell membrane
  2.    Induction of apoptosis
  3.    None of these
  4.    Inactivation of a translational elongation factor
 Discuss Question
Answer: Option D. -> Inactivation of a translational elongation factor
Question 13. The development of global regulatory systems in prokaryotes
  1.    determines the exact location of the replication site
  2.    aids in DNA replication
  3.    regulates many genes under varying environmental conditions
  4.    determines the exact location of the cell on the globe
 Discuss Question
Answer: Option C. -> regulates many genes under varying environmental conditions
Question 14. The interaction between the mRNA and tRNA determined the position of amino acid in a polypeptide sequence. This is called the
  1.    promiscuity
  2.    stagerivity
  3.    Wobble hypothesis
  4.    adaptor hypothesis
 Discuss Question
Answer: Option D. -> adaptor hypothesis
Question 15. Which of the following three codons translate as serine (Ser)?
  1.    AUG
  2.    AGU
  3.    CAU
  4.    CGA
 Discuss Question
Answer: Option B. -> AGU
Question 16. The role of molecular chaperones is to
  1.    facilitate binding of ribosomes to mRNA
  2.    degrade newly synthesized polypeptides that contain inaccurate sequences
  3.    facilitate binding of RNA polymerase to DNA
  4.    aid a newly synthesized polypeptide in folding to its proper shape
 Discuss Question
Answer: Option D. -> aid a newly synthesized polypeptide in folding to its proper shape
Question 17. A quorum sensing system
  1.    consists of a sensor component that phosphorylates a regulatory protein
  2.    controls the activity of ribosomes directly
  3.    senses a compound produced by the bacterium itself
  4.    detects a signal from the external environment
 Discuss Question
Answer: Option C. -> senses a compound produced by the bacterium itself
Question 18. What was the first bacterial genome to be sequenced and made public?
  1.    No bacterial genome has been sequenced yet
  2.    Escherichia coli
  3.    Bacillus subtilis
  4.    Haemophilus influenzae
 Discuss Question
Answer: Option D. -> Haemophilus influenzae
Question 19. What is the action of tetracycline in prokaryotes?
  1.    Not known with certainity
  2.    It blocks peptidyl transferase reaction on ribosomes
  3.    It blocks translocation reaction on ribosomes
  4.    It blocks the binding of amino-acyl tRNA to the A site of ribosomes
 Discuss Question
Answer: Option D. -> It blocks the binding of amino-acyl tRNA to the A site of ribosomes
Question 20. The Shine-Dalgarno sequence is
  1.    the reading frame of a gene
  2.    trailer sequence
  3.    a short sequence that acts as a ribosomal binding site
  4.    a stop codon
 Discuss Question
Answer: Option C. -> a short sequence that acts as a ribosomal binding site

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