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MCQs

Total Questions : 369 | Page 3 of 37 pages
Question 21. 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
Answer: (a).30S ribosomal subunit, mRNA, initiation factors and N-fMet tRNA
Question 22. 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
Answer: (d).binds to an mRNA codon
Question 23. 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
Answer: (a).Anticodon
Question 24. 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.
Answer: (b).DNA Pol III at a replication fork.
Question 25. 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
Answer: (a).on the large subunit
Question 26. Which of the following amino acid starts all proteins synthesis?
  1.    Glycine
  2.    Proline
  3.    Thymine
  4.    Methionine
 Discuss Question
Answer: Option D. -> Methionine
Answer: (d).Methionine
Question 27. 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
Answer: (d).binding of mRNA to the small ribosomal subunit
Question 28. Which of the following RNAs bind to an amino acid?
  1.    mRNA
  2.    tRNA
  3.    rRNA
  4.    hnRNA
 Discuss Question
Answer: Option B. -> tRNA
Answer: (b).tRNA
Question 29. 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
Answer: (a).a chain terminating codon is reached
Question 30. How many bases of nucleic acid determine a single amino acid?
  1.    Four
  2.    One
  3.    Two
  4.    Three
 Discuss Question
Answer: Option D. -> Three
Answer: (d).Three

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