Multiple Choice
In DNA, which nitrogenous base pairs with adenine?
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7. DNA and Chromosome Structure
DNA Structure
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How many hydrogen bonds are formed between adenine and thymine in the double DNA helix?
A
3
B
1
C
2
D
4
Verified step by step guidance1
Recall that in the DNA double helix, base pairing occurs between purines and pyrimidines: adenine (A) pairs with thymine (T), and guanine (G) pairs with cytosine (C).
Understand that the stability of these base pairs is due to hydrogen bonds formed between specific atoms on the bases.
Remember the specific number of hydrogen bonds for each base pair: adenine and thymine form two hydrogen bonds, while guanine and cytosine form three hydrogen bonds.
Identify the hydrogen bonding pattern between adenine and thymine by considering the donor and acceptor groups on each base that participate in hydrogen bonding.
Conclude that adenine and thymine are connected by exactly two hydrogen bonds in the DNA double helix.
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