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Biology · 2024 · 1 mark
CBSE 2024 · Region 5 · Set 2 · Q14
Assertion (A): The sugar-phosphate backbone of two chains in DNA double helix show anti-parallel polarity. Reason (R): The phosphor-diester bonds in…
Assertion (A): The sugar-phosphate backbone of two chains in DNA double helix show anti-parallel polarity.
Reason (R) : The phosphor-diester bonds in one strand go from a $\displaystyle 3$' carbon of one nucleotide to a $\displaystyle 5$' carbon of adjacent nucleotide, whereas those in complementary strand go vice versa.
Official answer
(A)
Both (A) and (R) are true and (R) is the correct explanation of (A).
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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.