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A pair of nitrogenous bases, consisting of a purine linked by hydrogen bonds to a pyrimidine that connects the complementary strands.

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The bases in DNA (adenine, thymine, cytosine, and guanine) form hydrogen bonds with each other. Adenine pairs with thymine, and cytosine pairs with guanine. This pairing creates a double helix structure, with the bases forming the "rungs" of the ladder and the sugar-phosphate backbone forming the "rails". This hydrogen bonding between the bases is responsible for the stability and shape of the DNA helix.

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1y ago
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Q: How do the bases help form the helix shape?
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