DNA MCQs with answers Page - 8

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. Assertion (A): Lagging strand is synthesized discontinuously.
Reason (R): DNA polymerase works only in 5'→3' direction.

  • (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

A

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Q. Assertion (A): Helicase breaks hydrogen bonds during replication.
Reason (R): Helicase synthesizes RNA primers.

  • (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

A

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Q. Assertion (A): Telomerase prevents shortening of chromosomes.
Reason (R): Telomerase adds repetitive nucleotide sequences at chromosome ends.

  • (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

A

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Q. Assertion (A): Okazaki fragments are found in leading strand.
Reason (R): Leading strand is synthesized continuously.

  • (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 false but R is true
  • (D) A is true but R is false

A

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Q. Assertion (A): RNA polymerase requires a primer.
Reason (R): RNA polymerase can initiate synthesis de novo.

  • (A) Both A and R are true and R is correct
  • (B) Both A and R are false
  • (C) A is false but R is true
  • (D) A is true but R is false

A

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Q. Assertion (A): Histones are positively charged proteins.
Reason (R): They interact with negatively charged DNA.

  • (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

A

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Q. Assertion (A): DNA ligase forms phosphodiester bonds.
Reason (R): It joins Okazaki fragments during replication.

  • (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

A

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Q. Assertion (A): DNA replication occurs in S-phase.
Reason (R): Cell division occurs in S-phase.

  • (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

A

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Q. Assertion (A): Adenine pairs with Thymine.
Reason (R): They form two hydrogen bonds.

  • (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

A

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Q. Assertion (A): Guanine pairs with Cytosine.
Reason (R): They form three hydrogen bonds.

  • (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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