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Biology · 2025 · 2 marks
Biotechnology : Principles and ProcessesProcesses of Recombinant DNA Technology2 marksApplyvery short answer
CBSE 2025 · Region 2 · Set 1 · Q20
Observe the given sequence of nitrogenous bases on a DNA fragment and answer the following questions: (a) Name the restriction enzyme which can…
Observe the given sequence of nitrogenous bases on a DNA fragment and answer the following questions :
(a)
Name the restriction enzyme which can recognise the DNA sequence.
(b)
Write the sequence after restriction enzyme cut the palindrome.
(c)
Why are the ends generated after digestion called as 'Sticky Ends'?
Marking-scheme solution
(a)
EcoRI
(b)
(c)
Ends are called as sticky ends because they form hydrogen bonds with their complementary cut counterparts.
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CBSE Class 12 Biology past-paper question from the 2025 board exam, with the answer as CBSE’s own marking scheme gives it. Where our answers come from.