In what sense are the two strands of DNA not identical but complementary to each other?
Solution
The strands have different base sequences (not identical), yet hydrogen bonding allows only A···T and G···C pairs; wherever one strand carries A the other must carry T, and so on — each strand is the \textbf{complement} of the other.
CBSE Class 12 Board · 2002 · All India · Subjective