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Biotechnology: Principles and Processes — BIOLOGY STD 12 Science — Question

Maharashtra BoardEnglish MediumSTD 12 ScienceBIOLOGYBiotechnology: Principles and Processes1 Mark
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 : Restriction endonuclease recognises palindromic sequence in $\text{DNA}$A and cuts them.
Reason : Palindromic sequence has two unique recognition sites Pst $I$ and Pvu $I$ recognised by restriction endonuclease.
  • 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.
A palindromic sequence in $\text{DNA}$ is one in which the $5\ '$ to $3\ '$ base pair sequence is identical on both strands.
Restriction enzymes recognise and make a cut within specific palindromic sequence, known as restriction sites, in the $\text{DNA}$.
This is usually a $4$ or $6$ base pair sequence.

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