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MCQs

Total Questions : 68 | Page 6 of 7 pages
Question 51. . Degenerated codon differs mostly in
  1.    the identities of their second base
  2.    the identities of their third base
  3.    the wobble position
  4.    both (b) and (c)
 Discuss Question
Answer: Option D. -> both (b) and (c)
Question 52. . The direction of amino acid transfer to the growing polypeptide chain is
  1.    from the A (aminoacyl tRNA site) site to the P (peptidyl tRNA site) site on the ribosome
  2.    from the P site to the A site on the ribosome
  3.    from the A site to the E (exit tRNA site) site on the ribosome
  4.    from the P site to the E site on the ribosome
 Discuss Question
Answer: Option B. -> from the P site to the A site on the ribosome
Question 53. . Translation in prokaryotes begins by the formation of a 30S initiation complex between the
  1.    30S ribosomal subunit, mRNA, initiation factors and N-fMet tRNA
  2.    30S ribosomal subunit, tRNA and initiation factors
  3.    30S ribosomal subunit and mRNA only
  4.    30S ribosomal subunit, mRNA and initiation factors
 Discuss Question
Answer: Option A. -> 30S ribosomal subunit, mRNA, initiation factors and N-fMet tRNA
Question 54. . The anticodon of tRNA
  1.    binds to rRNA
  2.    binds to an amino acid
  3.    binds to the Shine Dalgarno sequence
  4.    binds to an mRNA codon
 Discuss Question
Answer: Option D. -> binds to an mRNA codon
Question 55. . Processive synthesis is a characteristic feature of
  1.    all DNA polymerases.
  2.    DNA Pol III at a replication fork.
  3.    removal of RNA primers on Okasaki fragments.
  4.    DNA mismatch repair
 Discuss Question
Answer: Option B. -> DNA Pol III at a replication fork.
Question 56. . The peptidyl transferase reaction occurs
  1.    on the large subunit
  2.    on the small subunit
  3.    between the subunit
  4.    none of these
 Discuss Question
Answer: Option A. -> on the large subunit
Question 57. . Which site of the tRNA molecule binds to the mRNA molecule?
  1.    Anticodon
  2.    Codon
  3.    Amino acid
  4.    5 prime end
 Discuss Question
Answer: Option A. -> Anticodon
Question 58. . Which of the following amino acid starts all proteins synthesis?
  1.    Glycine
  2.    Proline
  3.    Thymine
  4.    Methionine
 Discuss Question
Answer: Option D. -> Methionine
Question 59. . The first step in translation is
  1.    binding of the two ribosomal subunits to each other
  2.    binding of mRNA to the two ribosomal subunits
  3.    binding of tRNA to the small ribosomal subunit
  4.    binding of mRNA to the small ribosomal subunit
 Discuss Question
Answer: Option D. -> binding of mRNA to the small ribosomal subunit
Question 60. . The growing polypeptide chain is released from the ribosomes when
  1.    a chain terminating codon is reached
  2.    a chain terminating tRNA binds to the ribosome
  3.    the 7-methyl guanosine cap is reached
  4.    the poly A tail is reached
 Discuss Question
Answer: Option A. -> a chain terminating codon is reached

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