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(C) The structure of $DNA$ consists of two polynucleotide chains that form a double helix. These two strands are complementary to each other,meaning t

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Complementary and antiparallel

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(C) The structure of $DNA$ consists of two polynucleotide chains that form a double helix. These two strands are complementary to each other,meaning the sequence of bases in one strand determines the sequence in the other due to specific base pairing rules ($A$ pairs with $T$,and $G$ pairs with $C$). Furthermore,the two strands run in opposite directions,meaning one strand runs in the $5' \rightarrow 3'$ direction,while the other runs in the $3' \rightarrow 5'$ direction. This orientation is referred to as antiparallel.

The two strands of $DNA$ are

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