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MCQs

Total Questions : 68 | Page 4 of 7 pages
Question 31. The ribosomes are composed of
  1.    RNA
  2.    both (a) and (b)
  3.    proteins
  4.    lipids
 Discuss Question
Answer: Option B. -> both (a) and (b)
Question 32. Which is required for protein synthesis?
  1.    mRNA
  2.    tRNA
  3.    rRNA
  4.    All of these
 Discuss Question
Answer: Option D. -> All of these
Question 33.  On the ribosome, mRNA binds
  1.    between the subunits
  2.    to the large subunit
  3.    to the small subunit
  4.    none of these
 Discuss Question
Answer: Option C. -> to the small subunit
Question 34.  Which of the following is not a necessary component of translation?
  1.    Anticodon
  2.    mRNA
  3.    Ligase
  4.    Amino acid
 Discuss Question
Answer: Option C. -> Ligase
Question 35.  Type I proteins (plasma membrane) have a
  1.    cleavage N- terminal signal sequence and a hydrophobic stop transfer sequence
  2.    cleavaged N- terminal signal sequence that doubles as the membrane anchoring sequence
  3.    multiple signal sequence and a hydrophobic stop transfer sequence
  4.    multiple signal sequence that doubles as the membrane anchoring sequence
 Discuss Question
Answer: Option A. -> cleavage N- terminal signal sequence and a hydrophobic stop transfer sequence
Question 36.  A polysome could be best described as
  1.    an active site of DNA synthesis.
  2.    an active site of protein synthesis.
  3.    an active site of lipid synthesis.
  4.    all of the above.
 Discuss Question
Answer: Option B. -> an active site of protein synthesis.
Question 37.  Eukaryotic mRNA binding to the ribosomes is facilitated by __________ .
  1.    the Shine Dalgarno sequence
  2.    the 7-methyl guanosine cap
  3.    tRNA
  4.    poly A tail
 Discuss Question
Answer: Option B. -> the 7-methyl guanosine cap
Question 38.  Amino acids are joined together into a protein chain by which of the following?
  1.    Transfer RNA
  2.    DNA polymerase
  3.    Hydrogen bonds
  4.    Messenger RNA
 Discuss Question
Answer: Option A. -> Transfer RNA
Question 39.  Phosphorus is taken up by the cell during the process of
  1.    carbohydrate synthesis.
  2.    protein synthesis
  3.    lipid synthesis.
  4.    ATP synthesis.
 Discuss Question
Answer: Option D. -> ATP synthesis.
Question 40.  Protein synthesis rates in prokaryotes are limited by the rate of mRNA synthesis. If RNA synthesis occurs at the rate of 50 nucleotides/sec, then rate of protein synthesis occurs at
  1.    10 amino acids/sec
  2.    17 amino acids/sec
  3.    25 amino acids/sec
  4.    50 amino acids/sec
 Discuss Question
Answer: Option B. -> 17 amino acids/sec

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