DNA MCQs with answers Page - 7

You will find multiple-choice questions (MCQs) related to #DNA here. Go through these questions to prepare effectively for your upcoming exams and interviews.

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A

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Q. Which enzyme removes RNA primers in prokaryotes?

  • (A) DNA polymerase I
  • (B) DNA polymerase III
  • (C) Ligase
  • (D) Helicase

A

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Q. Which type of bond connects nucleotides in DNA strand?

  • (A) Hydrogen bond
  • (B) Peptide bond
  • (C) Phosphodiester bond
  • (D) Ionic bond

A

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Q. The unwinding of DNA helix occurs at:

  • (A) Origin of replication
  • (B) Centromere
  • (C) Telomere
  • (D) Promoter region

A

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Q. Which model of DNA replication is NOT correct?

  • (A) Semiconservative
  • (B) Conservative
  • (C) Dispersive
  • (D) All are correct models

A

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Q. What is the function of single-strand binding proteins?

  • (A) Cut DNA
  • (B) Stabilize unwound strands
  • (C) Join DNA fragments
  • (D) Synthesize primers

A

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Q. Which codon acts as a start codon?

  • (A) UAA
  • (B) AUG
  • (C) UAG
  • (D) UGA

A

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Q. Which enzyme synthesizes RNA from DNA template?

  • (A) DNA polymerase
  • (B) RNA polymerase
  • (C) Ligase
  • (D) Helicase

A

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Q. Chargaff's rule states that:

  • (A) A = C, G = T
  • (B) A = T, G = C
  • (C) A + T = G + C
  • (D) A ≠ T

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Q. Assertion (A): DNA replication is semiconservative.
Reason (R): Each daughter DNA contains one parental and one newly synthesized strand.

  • (A) Both A and R are true and R is the correct explanation of A
  • (B) Both A and R are true but R is not the correct explanation of A
  • (C) A is true but R is false
  • (D) A is false but R is true

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Q. Assertion (A): DNA polymerase can initiate DNA synthesis.
Reason (R): DNA polymerase requires a free 3'-OH group to add nucleotides.

  • (A) Both A and R are true and R is correct
  • (B) Both A and R are true but R is not correct
  • (C) A is true but R is false
  • (D) A is false but R is true

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