Translation and Regulation MCQs

Microbiology Objective Questions

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22. Which of the following modified amino acid is used at the starting of most prokaryotic proteins?

A. N-formylserine

B. N-formylmethionine

C. N-formylleucine

D. N-formylalanine

23. During amino acid activation a(n)

A. amino acid is bound to tRNA

B. amino acid is bound to mRNA

C. methyl group is attached to rRNA

D. methyl group is attached to an amino acid

24. The nonsense codon(s) is/are

D. all of these

25. Which of the following defines an open reading frame (ORF)?

A. A sequence of genome in bacteriophage

B. The sequence of a complete genome

C. A plasmid vector used in genome sequencing

D. A possible gene predicted by DNA sequencing

26. Three stop codons, which aids in termination of translation are also known as

A. pause codons

B. nonsense codons

C. missense codons

D. antisense codons

27. The ribosome binding site

A. forms a stem-loop structure in the RNA

B. is located upstream of the promoter sequence

C. is located immediately upstream of the start codon

D. is more likely to be associated with an operon than with a gene encoding a single protein

28. Which of the following molecule catalyzes the transpeptidation reaction?

A. RNA polymerase

B. Peptidyl transferase

D. DNA polymerase

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