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MCQs

Total Questions : 101 | Page 8 of 11 pages
Question 71. Which enzyme catalyzes the elongation of DNA molecules?
  1.    Primase
  2.    Helicase
  3.    DNA ligase
  4.    DNA polymerase
 Discuss Question
Answer: Option D. -> DNA polymerase
Question 72. There is a single origin for DNA replication in bacteria. How many origins of replication are found in the much larger genomes of eukaryotes such as mammals?
  1.    One
  2.    About 100
  3.    none of these
  4.    Thousands and tens of thousands
 Discuss Question
Answer: Option D. -> Thousands and tens of thousands
Question 73. Okazaki fragments occur on the __________ and are bonded together by __________
  1.    tRNA, polymerase
  2.    Leading strand, polymerase
  3.    mRNA, anticodons
  4.    Lagging strand, ligase
 Discuss Question
Answer: Option D. -> Lagging strand, ligase
Question 74. What is the IUPAC code for an A, C, T ambiguity in a nucleic acid sequence?
  1.    H
  2.    S
  3.    None of these
  4.    B
 Discuss Question
Answer: Option A. -> H
Question 75. Automated DNA sequencing uses the chain termination method
  1.    but with an oligonucleotide primer labeled with a fluorescent dye
  2.    either (b) or (c)
  3.    but with a polynucleotide primer labeled with a fluorescent dye
  4.    with no primer
 Discuss Question
Answer: Option A. -> but with an oligonucleotide primer labeled with a fluorescent dye
Question 76. The RNA primers used to initiate replication in E. coli
  1.    are removed by Pol I
  2.    are joined together by DNA ligase
  3.    result in Okazaki fragments on leading strand
  4.    are removed by helicase + ATP
 Discuss Question
Answer: Option A. -> are removed by Pol I
Question 77. DNA with a G-C content of 50% will melt at approximately
  1.    100 °C
  2.    90 °C
  3.    70 °C
  4.    60°C
 Discuss Question
Answer: Option B. -> 90 °C
Question 78. Which of the following is not a structural motif in DNA binding proteins?
  1.    zinc finger
  2.    TFIID
  3.    helix-turn-helix
  4.    bZIP
 Discuss Question
Answer: Option B. -> TFIID
Question 79. An enzyme that recognizes foreign DNA, and results in a cut in that DNA is called
  1.    restriction endonuclease
  2.    reverse transcriptase
  3.    helicase
  4.    transposase
 Discuss Question
Answer: Option A. -> restriction endonuclease
Question 80. Which of the following is an active site on its single polypeptide chain for DNA Polymerase I?
  1.    5' → 3' polymerase
  2.    3' → 5' exonuclease
  3.    All of these
  4.    5' → 3' exonuclease
 Discuss Question
Answer: Option A. -> 5' → 3' polymerase

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