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The DNA segment displayed in the diagram represents a palindromic sequence of nucleotide pairs.

1. (a)
2. (b)
3. (c)
4. (d)

Correct answer: (d)

Solution

A palindromic DNA sequence has inverted symmetry: when each strand is read in the 5'→3' direction, the sequence is identical on both strands. Option (d) is the one that satisfies this base-pairing symmetry.

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