MCQ
Two statements are given$-$one labelled Assertion and the other labelled Reason. Select the correct answer to these questions from the codes $(a), (b), (c)$ and $(d)$ as given below.
Assertion: Molecular probes are available for diagnosing genetic disorders, e.g., Duchenne muscular dystrophy, cystic fibrosis, Tay$-$sach's disease.
Reason: The molecular probes are usually double stranded pieces of $\text{DNAs,}$ labelled with radio isotopes such as $32P.$
  • A
    Both assertion and reason are true and reason is the correct explanation of assertion.
  • B
    Both assertion and reason are true but reason is not the correct explanation of assertion.
  • Assertion is true but reason is false.
  • D
    Both assertion and reason are false.

Answer

Correct option: C.
Assertion is true but reason is false.
$\text{DNA}$ probes are stretches of single$-$stranded $\text{DNA}$ used to detect presence of complementarynucleic acid sequence $($target sequences$)$ by hybridisation. They are usually labelled with radioisotopes, to enable their detection.

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