Question

Assertion: Restriction enzymes recognise specific palindromic sequences.
Reason: Palindromic sequences are DNA sequences that are read the same way when the orientation is kept the same in both the strands.

• 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
• C. Assertion is true but reason is false
• D. Both assertion and reason are false

Answer 1

The correct option is B Both assertion and reason are true but reason is not the correct explanation of assertion

Restriction enzymes are a type of endonucleases that cleave phosphodiester bonds between consecutive nucleotides within or near to specific DNA sequences known as recognition sites. Recognition sites are the sites on polynucleotide strand that are usually palindromic in nature, identified by restriction enzyme for the purpose of cleavage.
Palindromic sequences are DNA sequences that are read the same way forward or backward when the polarity is kept the same in both the strands.
Example: The recognition site for the restriction enzyme EcoR I is given below:-


Hence, both the assertion and reason are true but the reason is not the correct explanation of assertion.