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The "rungs" of DNA are made of

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four nitrogen-containing bases—two purines (adenine [A] and guanine [G]) and two pyrimidines (cytosine [C] and thymine [T]).
User Andrew Templeton
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Answer:

The "rings" of DNA are made of 4 carbons and 2 nitrogen molecules

(pyrimidines and purines respectively)

Step-by-step explanation:

User Htellez
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