Multiple Choice
Which of the following statements about human DNA is correct?
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7. DNA and Chromosome Structure
DNA Structure
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Which purine base forms 3 hydrogen bonds when binding its complementary nucleotide base?
A
Guanine
B
Cytosine
C
Thymine
D
Adenine
Verified step by step guidance1
Recall that DNA base pairing involves purines pairing with pyrimidines through hydrogen bonds.
Identify the purine bases: Adenine (A) and Guanine (G). The pyrimidine bases are Cytosine (C) and Thymine (T).
Remember the specific base pairing rules: Adenine pairs with Thymine, and Guanine pairs with Cytosine.
Understand that the number of hydrogen bonds differs between these pairs: A-T pairs form 2 hydrogen bonds, while G-C pairs form 3 hydrogen bonds.
Since Guanine is a purine that pairs with Cytosine via 3 hydrogen bonds, the purine base forming 3 hydrogen bonds is Guanine.
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