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Given below are two statements: one is labelled as Assertion (A) and the other is labelled as Reason (R). Assertion (A): Recombinant DNA can easily pass through the intact cell membrane of host cells on its own without any specialized treatment. Reason (R): DNA is a hydrophilic molecule, which prevents it from crossing the lipid bilayer of the cell membrane. In the light of the above statements, choose the most appro

Options

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

Correct answer

D. Assertion is false but Reason is true.

Step-by-step solution

Assertion is false because recombinant DNA cannot spontaneously enter host cells; specialized chemical treatments (making cells competent) or physical methods (like micro-injection or biolistics) are required to introduce it. Reason is true because DNA is a hydrophilic molecule. The cell membrane has a hydrophobic lipid bilayer core, which prevents hydrophilic molecules like DNA from passing through on their own. Therefore, Assertion is false but Reason is true. Answer: Assertion is false but Reason is true.

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