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Home » Genetics MCQ

Genetics MCQ

Total MCQ: 20

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1 Which enzyme is responsible for unwinding the DNA double helix?

  • A) Helicase
  • B) DNA polymerase
  • C) Ligase
  • D) Topoisomerase
View Answer & Discuss

2 What is the function of DNA polymerase during replication?

  • A) Unwinds the DNA
  • B) Synthesizes new RNA strands
  • C) Adds nucleotides to the growing DNA strand
  • D) Joins Okazaki fragments
View Answer & Discuss

3 In which direction does DNA replication occur?

  • A) 5' to 3'
  • B) 3' to 5'
  • C) Both directions simultaneously
  • D) 3' to 3'
View Answer & Discuss

4 What is the role of primase in DNA replication?

  • A) Unwinds the DNA
  • B) Synthesizes the RNA primer
  • C) Adds nucleotides to the new strand
  • D) Removes RNA primers
View Answer & Discuss

5 What is the function of ligase in DNA replication?

  • A) Unwinds the DNA
  • B) Adds nucleotides to the growing strand
  • C) Joins Okazaki fragments
  • D) Synthesizes RNA primers
View Answer & Discuss

6 Which strand is synthesized discontinuously during DNA replication?

  • A) Leading strand
  • B) Lagging strand
  • C) Both strands simultaneously
  • D) Both strands continuously
View Answer & Discuss

7 What is the purpose of the RNA primer in DNA replication?

  • A) To bind to the leading strand
  • B) To provide a 3' OH group for DNA polymerase
  • C) To unwind the DNA helix
  • D) To remove nucleotides from the lagging strand
View Answer & Discuss

8 During which phase of the cell cycle does DNA replication occur?

  • A) G1 phase
  • B) G2 phase
  • C) S phase
  • D) M phase
View Answer & Discuss

9 What is the function of topoisomerase during DNA replication?

  • A) Adds nucleotides to the growing strand
  • B) Relieves the strain caused by unwinding DNA
  • C) Synthesizes RNA primers
  • D) Joins Okazaki fragments
View Answer & Discuss

10 What is the name of the short segments of DNA synthesized on the lagging strand?

  • A) Okazaki fragments
  • B) Leading fragments
  • C) Replication bubbles
  • D) Primer fragments
View Answer & Discuss
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