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NEETZoologyMolecular Basis of Inheritance

Given below are two statements: one is labelled as Assertion (A) and the other is labelled as Reason (R). Assertion (A): The formation of a nucleosome relies on strong electrostatic attraction between DNA and the histone octamer. Reason (R): DNA is a positively charged molecule due to its phosphate groups, which wraps around the negatively charged histone octamer. In the light of the above statements, choose the corr

Options

  1. ABoth Assertion (A) and Reason (R) are true and Reason (R) is the correct explanation of Assertion (A)
  2. BBoth Assertion (A) and Reason (R) are true but Reason (R) is not the correct explanation of Assertion (A)
  3. CAssertion (A) is true but Reason (R) is false
  4. DAssertion (A) is false but Reason (R) is true

Correct answer

C. Assertion (A) is true but Reason (R) is false

Step-by-step solution

Assertion (A) is true. The formation and stability of a nucleosome are fundamentally driven by the electrostatic attraction between the DNA molecule and the histone octamer. Reason (R) is false. DNA is a negatively charged molecule due to the presence of phosphate groups in its backbone. It wraps around the histone octamer, which is positively charged because it is rich in basic amino acid residues like lysine and arginine. Therefore, Assertion (A) is true but Reason (R) is false. Answer: Assertion (A) is true but

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