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MCQs

Total Questions : 68 | Page 2 of 7 pages
Question 11. Which of the following is not necessary for protein synthesis to occur, once transcription is completed?
  1.    Ribosomes
  2.    DNA
  3.    tRNA
  4.    mRNA
 Discuss Question
Answer: Option B. -> DNA
Question 12. Signal peptide protein removal that is translocated across a membrane is accomplished by
  1.    fMet aminopeptidase
  2.    signal peptidase
  3.    trypsin
  4.    chymotrypsin
 Discuss Question
Answer: Option B. -> signal peptidase
Question 13. The lac operon contains the z, y and a structural genes
  1.    encoding p-galactosidase, galactose permeases and thio-galactosidase transacetylase respectively
  2.    encoding P-galactosidase only
  3.    None of these
  4.    encoding p-galactosidase and galactose permeases
 Discuss Question
Answer: Option A. -> encoding p-galactosidase, galactose permeases and thio-galactosidase transacetylase respectively
Question 14. Proteins contain __________ different amino acids, whereas DNA and RNA are composed of __________ different nucleotides
  1.    20,64
  2.    3,20
  3.    4,20
  4.    20,4
 Discuss Question
Answer: Option D. -> 20,4
Question 15. Ribosomes select the correct tRNAs
  1.    then bind to the appropriate mRNA
  2.    depending on their abundance in the cytosol
  3.    with the least abundant anticodons
  4.    solely on the basis of their anticodons
 Discuss Question
Answer: Option D. -> solely on the basis of their anticodons
Question 16. The direction of amino acid transfer to the growing polypeptide chain is
  1.    from the A site to the E (exit tRNA site) site on the ribosome
  2.    from the P site to the E site on the ribosome
  3.    from the P site to the A site on the ribosome
  4.    from the A (aminoacyl tRNA site) site to the P (peptidyl tRNA site) site on the ribosome
 Discuss Question
Answer: Option C. -> from the P site to the A site on the ribosome
Question 17. The pathway of a tRNA during polypeptide elongation on the ribosome is
  1.    A site → P site → E site
  2.    A site → P site → entry site
  3.    P site → entry site → exit site
  4.    P site → A site → E site
 Discuss Question
Answer: Option A. -> A site → P site → E site
Question 18. The site on a bacterial chromosome that marks the termination point for chromosome replication is called
  1.    ter
  2.    a stem-loop
  3.    pau
  4.    a stop codon.
 Discuss Question
Answer: Option A. -> ter
Question 19. Which of the following has unusual bases?
  1.    mRNA
  2.    rRNA
  3.    hnRNA
  4.    tRNA
 Discuss Question
Answer: Option D. -> tRNA
Question 20. Degenerated codon differs mostly in
  1.    both (b) and (c)
  2.    the identities of their second base
  3.    the wobble position
  4.    the identities of their third base
 Discuss Question
Answer: Option A. -> both (b) and (c)

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