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In a DNA double helix

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The single strands are not helical

Phosphodiester bonds are oriented towards the interior of the helix

Adenine on one strand is hydrogen bonded to thymine on the opposite strand

Hydrogen bonds are formed between a purine and pyrimidine base on the same strand

answer is C.

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Detailed Solution

In a DNA double helix adenine on one strand is hydrogen bonded to thymine on the opposite strand.

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