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Biology · 2026 · 2 marks
Biotechnology : Principles and ProcessesProcesses of Recombinant DNA Technology2 marksUnderstandvery short answer
CBSE 2026 · Region 1 · Set 1 · Q19
Study the sequence of bases in a DNA molecule that is shown below and answer the questions. (a) What are such sequences called? Name the enzyme used…
Study the sequence of bases in a DNA molecule that is shown below and answer the questions.
(a)
What are such sequences called? Name the enzyme used that recognises such nucleotide sequences.
(b)
How do these enzymes function?
Marking-scheme solution
(a)
• Palindromic sequences
• Restriction endonuclease / EcoRI.
(b)
Restriction endonucleases cut the strands of DNA a little away from the centre of the palindrome sites to form sticky end on each strand / Restriction endonucleases cut at specific recognition site between two same bases in opposite strands to produce sticky ends / EcoRI cuts the DNA between bases G and A in both the strand in the sequence
giving the two fragments
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CBSE Class 12 Biology past-paper question from the 2026 board exam, with the answer as CBSE’s own marking scheme gives it. Where our answers come from.