Purines can form hydrogen bonds with which type of base?

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Multiple Choice

Purines can form hydrogen bonds with which type of base?

Explanation:
Purines form hydrogen bonds with pyrimidines to create stable base pairs. The two-ring purines (adenine and guanine) pair with the single-ring pyrimidines (cytosine and thymine in DNA; cytosine and uracil in RNA) in a way that keeps the helix width consistent. Adenine pairs with thymine via two hydrogen bonds, and guanine pairs with cytosine via three hydrogen bonds. Hydrogen bonding occurs between bases, not with sugars or the rest of the nucleotide, so purines specifically seek pyrimidines as their pairing partners.

Purines form hydrogen bonds with pyrimidines to create stable base pairs. The two-ring purines (adenine and guanine) pair with the single-ring pyrimidines (cytosine and thymine in DNA; cytosine and uracil in RNA) in a way that keeps the helix width consistent. Adenine pairs with thymine via two hydrogen bonds, and guanine pairs with cytosine via three hydrogen bonds. Hydrogen bonding occurs between bases, not with sugars or the rest of the nucleotide, so purines specifically seek pyrimidines as their pairing partners.

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