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MCQs

Total Questions : 58 | Page 4 of 6 pages
Question 31.  Which of the following act as the blueprint or template for the process of protein synthesis that takes place on ribosomes?
  1.    rRNA
  2.    DNA
  3.    tRNA
  4.    mRNA
 Discuss Question
Answer: Option D. -> mRNA
Question 32.  Which stop codon has been found to encode selenocysteine?
  1.    UAA
  2.    UAG
  3.    UGA
  4.    AGA
 Discuss Question
Answer: Option C. -> UGA
Question 33.  When was the genetic code completed?
  1.    1958
  2.    1952
  3.    1966
  4.    1968
 Discuss Question
Answer: Option C. -> 1966
Question 34.  Which of the following is a nontranslated sequence located between the transcription and the translation start site?
  1.    Ending frame
  2.    Leader sequence
  3.    Trailer sequence
  4.    Reading frame
 Discuss Question
Answer: Option B. -> Leader sequence
Question 35.  Site in the ribosome from which the tRNA donates amino acids to the growing polypeptide chain is
  1.    P site
  2.    O site
  3.    T site
  4.    A site
 Discuss Question
Answer: Option A. -> P site
Question 36.  Which phage always carries a small piece of E.coli genome?
  1.    Lambda
  2.    Mu
  3.    T4
  4.    T3
 Discuss Question
Answer: Option B. -> Mu
Question 37.  The final step of gene expression is protein synthesis, which is also known as
  1.    replication
  2.    translation
  3.    transcription
  4.    none of these
 Discuss Question
Answer: Option B. -> translation
Question 38. . The development of global regulatory systems in prokaryotes
  1.    determines the exact location of the cell on the globe
  2.    aids in DNA replication
  3.    determines the exact location of the replication site
  4.    regulates many genes under varying environmental conditions
 Discuss Question
Answer: Option D. -> regulates many genes under varying environmental conditions
Question 39. . What are the Svedberg values for the subunits of the 70S ribosomes of E. colli?
  1.    40S and 30S
  2.    50S and 20S
  3.    50S and 30S
  4.    40S and 20S
 Discuss Question
Answer: Option C. -> 50S and 30S
Question 40. . The interaction between the mRNA and tRNA determined the position of amino acid in a polypeptide sequence. This is called the
  1.    stagerivity
  2.    Wobble hypothesis
  3.    promiscuity
  4.    adaptor hypothesis
 Discuss Question
Answer: Option D. -> adaptor hypothesis

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