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MCQs

Total Questions : 68 | Page 3 of 7 pages
Question 21. Translation in prokaryotes begins by the formation of a 30S initiation complex between the
  1.    30S ribosomal subunit and mRNA only
  2.    30S ribosomal subunit, tRNA and initiation factors
  3.    30S ribosomal subunit, mRNA, initiation factors and N-fMet tRNA
  4.    30S ribosomal subunit, mRNA and initiation factors
 Discuss Question
Answer: Option C. -> 30S ribosomal subunit, mRNA, initiation factors and N-fMet tRNA
Question 22. Which site of the tRNA molecule binds to the mRNA molecule?
  1.    Codon
  2.    Amino acid
  3.    5 prime end
  4.    Anticodon
 Discuss Question
Answer: Option D. -> Anticodon
Question 23. The anticodon of tRNA
  1.    binds to an amino acid
  2.    binds to an mRNA codon
  3.    binds to rRNA
  4.    binds to the Shine Dalgarno sequence
 Discuss Question
Answer: Option B. -> binds to an mRNA codon
Question 24. The peptidyl transferase reaction occurs
  1.    on the large subunit
  2.    between the subunit
  3.    on the small subunit
  4.    none of these
 Discuss Question
Answer: Option A. -> on the large subunit
Question 25. 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 26. The first step in translation is
  1.    binding of mRNA to the two ribosomal subunits
  2.    binding of tRNA to the small ribosomal subunit
  3.    binding of mRNA to the small ribosomal subunit
  4.    binding of the two ribosomal subunits to each other
 Discuss Question
Answer: Option C. -> binding of mRNA to the small ribosomal subunit
Question 27. The growing polypeptide chain is released from the ribosomes when
  1.    the poly A tail is reached
  2.    a chain terminating codon is reached
  3.    a chain terminating tRNA binds to the ribosome
  4.    the 7-methyl guanosine cap is reached
 Discuss Question
Answer: Option B. -> a chain terminating codon is reached
Question 28. 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
Question 29. Which of the following amino acid starts all proteins synthesis?
  1.    Thymine
  2.    Proline
  3.    Methionine
  4.    Glycine
 Discuss Question
Answer: Option C. -> Methionine
Question 30. Which of the following RNAs bind to an amino acid?
  1.    tRNA
  2.    mRNA
  3.    rRNA
  4.    hnRNA
 Discuss Question
Answer: Option A. -> tRNA

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