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How many hydrogen bonds hold a cytosine and guanine pair together?

ATwo bonds
BThree bonds
CFour bonds
DOne bond
Answer & Solution
Correct answer: B. Three bonds
1. The two kinds of base pair are held with different strength. 2. Adenine and thymine form two hydrogen bonds. 3. Cytosine and guanine form three hydrogen bonds. 4. Three is therefore the stronger of the two pairings. _Source: OpenStax Biology for AP(R) Courses (CC BY 4.0), Ch 14 'DNA Structure and Function', sections 14.1-14.6_
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