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MCQs

Total Questions : 58 | Page 5 of 6 pages
Question 41. . 
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
Question 42. . 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
Question 43. . 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 44. . Which of the following three codons translate as serine (Ser)?
  1.    AGU
  2.    CGA
  3.    CAU
  4.    AUG
 Discuss Question
Answer: Option A. -> AGU
Question 45. . What is the action of tetracycline in prokaryotes?
  1.    It blocks translocation reaction on ribosomes
  2.    It blocks peptidyl transferase reaction on ribosomes
  3.    It blocks the binding of amino-acyl tRNA to the A site of ribosomes
  4.    Not known with certainity
 Discuss Question
Answer: Option C. -> It blocks the binding of amino-acyl tRNA to the A site of ribosomes
Question 46. . What was the first bacterial genome to be sequenced and made public?
  1.    Bacillus subtilis
  2.    Escherichia coli
  3.    Haemophilus influenzae
  4.    No bacterial genome has been sequenced yet
 Discuss Question
Answer: Option C. -> Haemophilus influenzae
Question 47. . The Shine-Dalgarno sequence is
  1.    trailer sequence
  2.    a stop codon
  3.    the reading frame of a gene
  4.    a short sequence that acts as a ribosomal binding site
 Discuss Question
Answer: Option D. -> a short sequence that acts as a ribosomal binding site
Question 48. . Which of the following statement is correct?
  1.    The size and sequence of introns can be deduced from the cDNA sequence
  2.    Restriction endonuclease can cleave ss and dsDNA both
  3.    Restriction fragment length polymorphism (RFLP) is usually formed in coding sequence of a gene
  4.    Amino acid sequence of a protein can be deduced from corresponding cDNA nucleotide
 Discuss Question
Answer: Option D. -> Amino acid sequence of a protein can be deduced from corresponding cDNA nucleotide
Question 49. . A quorum sensing system
  1.    detects a signal from the external environment
  2.    senses a compound produced by the bacterium itself
  3.    consists of a sensor component that phosphorylates a regulatory protein
  4.    controls the activity of ribosomes directly
 Discuss Question
Answer: Option B. -> senses a compound produced by the bacterium itself
Question 50. . Which of the following modified amino acid is used at the starting of most prokaryotic proteins?
  1.    N-formylserine
  2.    N-formylmethionine
  3.    N-formylleucine
  4.    N-formylalanine
 Discuss Question
Answer: Option B. -> N-formylmethionine

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