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Biology · 2026 · 3 marks
CBSE 2026 · Region 4 · Set 1 · Q23
(a) Construct a complete transcription unit with promoter and terminator on the basis of the hypothetical coding strand given below: (b) Write the…
(a)
Construct a complete transcription unit with promoter and terminator on the basis of the hypothetical coding strand given below:
(b)
Write the RNA strand transcribed from the above transcription unit along with its polarity.
Marking-scheme solution
(a)
(b)
The RNA transcribed is
$\displaystyle 5$′A U G C A U G C A U A G $\displaystyle 3$′
(a)
(b)
The RNA transcribed as
$\displaystyle 5$ 'G A U A C G U A C G U A $\displaystyle 3$'
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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.