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MCQs

Total Questions : 58 | Page 3 of 6 pages
Question 21. The nonsense codon(s) is/are
  1.    UGA
  2.    all of these
  3.    UAA
  4.    UAG
 Discuss Question
Answer: Option B. -> all of these
Question 22. During amino acid activation a(n)
  1.    methyl group is attached to rRNA
  2.    methyl group is attached to an amino acid
  3.    amino acid is bound to mRNA
  4.    amino acid is bound to tRNA
 Discuss Question
Answer: Option D. -> amino acid is bound to tRNA
Question 23. Three stop codons, which aids in termination of translation are also known as
  1.    missense codons
  2.    antisense codons
  3.    nonsense codons
  4.    pause codons
 Discuss Question
Answer: Option C. -> nonsense codons
Question 24. Which of the following modified amino acid is used at the starting of most prokaryotic proteins?
  1.    N-formylalanine
  2.    N-formylserine
  3.    N-formylmethionine
  4.    N-formylleucine
 Discuss Question
Answer: Option C. -> N-formylmethionine
Question 25. Which of the following defines an open reading frame (ORF)?
  1.    A plasmid vector used in genome sequencing
  2.    The sequence of a complete genome
  3.    A sequence of genome in bacteriophage
  4.    A possible gene predicted by DNA sequencing
 Discuss Question
Answer: Option D. -> A possible gene predicted by DNA sequencing
Question 26. Which of the termination codon is called amber?
  1.    UAG
  2.    UGA
  3.    UAA
  4.    AUG
 Discuss Question
Answer: Option A. -> UAG
Question 27. Which of the following molecule catalyzes the transpeptidation reaction?
  1.    DNA polymerase
  2.    RNA polymerase
  3.    DNA ligase
  4.    Peptidyl transferase
 Discuss Question
Answer: Option D. -> Peptidyl transferase
Question 28. The ribosome binding site
  1.    is more likely to be associated with an operon than with a gene encoding a single protein
  2.    is located immediately upstream of the start codon
  3.    is located upstream of the promoter sequence
  4.    forms a stem-loop structure in the RNA
 Discuss Question
Answer: Option B. -> is located immediately upstream of the start codon
Question 29.  Which binding is inhibited by pactamycin?
  1.    Aminoacyl-tRNA to the A-site of 30S subunit
  2.    Initiator-tRNA to 30S/40S initiation complexes
  3.    Peptidyl t-RNA to the 50S subunit
  4.    Formation of peptide bond in P site
 Discuss Question
Answer: Option B. -> Initiator-tRNA to 30S/40S initiation complexes
Question 30.  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

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