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MCQs

Total Questions : 68 | Page 5 of 7 pages
Question 41. . Which of the following is not necessary for protein synthesis to occur, once transcription is completed?
  1.    tRNA
  2.    Ribosomes
  3.    mRNA
  4.    DNA
 Discuss Question
Answer: Option D. -> DNA
Question 42. . The structure in a bacterium that indicates an active site for protein synthesis is
  1.    a chromosome.
  2.    a cell membrane,
  3.    a flagellum.
  4.    a polysome.
 Discuss Question
Answer: Option D. -> a polysome.
Question 43. . 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 44.  The site of protein synthesis is
  1.    Ribosome
  2.    Nucleus
  3.    Endoplasmic reticulum
  4.    Chromosome
 Discuss Question
Answer: Option A. -> Ribosome
Question 45. . 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 and galactose permeases
  3.    encoding P-galactosidase only
  4.    None of the above
 Discuss Question
Answer: Option A. -> encoding p-galactosidase, galactose permeases and thio-galactosidase transacetylase respectively
Question 46. . Ribosomes select the correct tRNAs
  1.    then bind to the appropriate mRNA
  2.    solely on the basis of their anticodons
  3.    depending on their abundance in the cytosol
  4.    with the least abundant anticodons
 Discuss Question
Answer: Option B. -> solely on the basis of their anticodons
Question 47. . Signal peptide protein removal that is translocated across a membrane is accomplished by
  1.    fMet aminopeptidase
  2.    trypsin
  3.    signal peptidase
  4.    chymotrypsin
 Discuss Question
Answer: Option C. -> signal peptidase
Question 48. . The site on a bacterial chromosome that marks the termination point for chromosome replication is called
  1.    ter
  2.    a stop codon
  3.    a stem-loop
  4.    pau
 Discuss Question
Answer: Option A. -> ter
Question 49. . Which of the following has unusual bases?
  1.    mRNA
  2.    tRNA
  3.    rRNA
  4.    hnRNA
 Discuss Question
Answer: Option B. -> tRNA
Question 50. . The pathway of a tRNA during polypeptide elongation on the ribosome is
  1.    A site → P site → E site
  2.    P site → entry site → exit site
  3.    A site → P site → entry site
  4.    P site → A site → E site
 Discuss Question
Answer: Option A. -> A site → P site → E site

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