Cytosine Is a Pyrimidine That Forms Three Hydrogen Bonds

question 12

Multiple Choice

Cytosine is a pyrimidine that forms three hydrogen bonds.Uracil is also a pyrimidine.Based on this information,one can conclude that uracil forms _______ hydrogen bonds and pairs with _______.

• A) three;guanine (a two-bond pyrimidine)
• B) three;adenine (a three-bond purine)
• C) three;guanine (a three-bond purine)
• D) two;adenine (a two-bond purine)
• E) two;thymine (a two-bond pyrimidine)

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