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MCQs

Total Questions : 241 | Page 7 of 25 pages
Question 61. Negative regulation of protein synthesis is accomplished by
  1.    allosteric inhibition
  2.    the binding of RNA polymerase to the promoter
  3.    the binding of a repressor to the DNA
  4.    the binding of a repressor to the RNA polymerase
 Discuss Question
Answer: Option C. -> the binding of a repressor to the DNA
Answer: (c).the binding of a repressor to the DNA
Question 62. Which of the following act as the blueprint or template for the process of protein synthesis that takes place on ribosomes?
  1.    rRNA
  2.    DNA
  3.    tRNA
  4.    mRNA
 Discuss Question
Answer: Option D. -> mRNA
Answer: (d).mRNA
Question 63. Which of the following three codons translate as serine (Ser)?
  1.    AGU
  2.    CGA
  3.    CAU
  4.    AUG
 Discuss Question
Answer: Option A. -> AGU
Answer: (a).AGU
Question 64. 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
Answer: (d).aid a newly synthesized polypeptide in folding to its proper shape
Question 65. 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
Answer: (c).It blocks the binding of amino-acyl tRNA to the A site of ribosomes
Question 66. 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
Answer: (d).a short sequence that acts as a ribosomal binding site
Question 67. 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
Answer: (b).senses a compound produced by the bacterium itself
Question 68. 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
Answer: (d).Amino acid sequence of a protein can be deduced from corresponding cDNA nucleotide
Question 69. During amino acid activation a(n)
  1.    amino acid is bound to tRNA
  2.    amino acid is bound to mRNA
  3.    methyl group is attached to rRNA
  4.    methyl group is attached to an amino acid
 Discuss Question
Answer: Option A. -> amino acid is bound to tRNA
Answer: (a).amino acid is bound to tRNA
Question 70. The nonsense codon(s) is/are
  1.    UAG
  2.    UAA
  3.    UGA
  4.    all of these
 Discuss Question
Answer: Option D. -> all of these
Answer: (d).all of these

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