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Bases in nucleic acids fall into two categories. Cytosine, thymine and uracil are:
APurine bases
BPyrimidines
CPentose sugars
DPhosphate groups
Answer & Solution
Correct answer: B. Pyrimidines
1. Nitrogenous bases are divided into two categories, purines and pyrimidines.
2. The division is by ring structure.
3. Cytosine, thymine and uracil each have a single carbon-nitrogen ring, which classifies them as pyrimidines.
4. Pentose sugars and phosphate groups are the other two nucleotide components, so neither is a base category.
_Source: OpenStax Biology for AP(R) Courses (CC BY 4.0), Ch 3 'Biological Macromolecules', sections 3.1-3.5_
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