BCH101intermediate
Adenine and guanine are classified as __________ because each has two fused rings.
Answer
purines
Explanation
### Why this is right
Purines are the two-ring nitrogenous bases. Adenine and guanine are the purines found in nucleic acids.
### The concept
The other major base family is the pyrimidines, which have one ring. Cytosine is found in both DNA and RNA; thymine is typical of DNA, and uracil is typical of RNA.
### Terms
- **Pyrimidine**: a one-ring nitrogenous base.
### Remember
Adenine and guanine are purines; cytosine, thymine, and uracil are pyrimidines.
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