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Biology · 2024 · 2 marks
Biotechnology : Principles and ProcessesProcesses of Recombinant DNA Technology2 marksAnalysevery short answer
CBSE 2024 · Region 3 · Set 2 · Q21
With reference to the set-ups (A, B and C) given below, of the electrophoretic separation of a mixture of DNA fragments of varied lengths, answer the…
With reference to the set-ups (A, B and C) given below, of the electrophoretic separation of a mixture of DNA fragments of varied lengths, answer the questions that follow :
(a)
In which one of the two Set-ups, A or B, would you see the DNA fragments separated and why? Justify your answer.
(b)
In Set-up C, which one of the two, I / II, are the bands of longer fragments of DNA ? Justify your answer.
Marking-scheme solution
(a)
Set up A,
DNA fragments being negatively charged move towards the anode on applying the
electric field
(b)
I
Smaller fragments will move faster as compared to longer fragments of DNA/
longer fragments will move slower as compared to smaller fragments of DNA
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CBSE Class 12 Biology past-paper question from the 2024 board exam, with the answer as CBSE’s own marking scheme gives it. Where our answers come from.