⟩ The purine bases are
1. adenine and guanine
2. adenine and cytosine
3. thymine and cytosine
4. uracil, thymine, and cytosine
Answer: A
1. adenine and guanine
2. adenine and cytosine
3. thymine and cytosine
4. uracil, thymine, and cytosine
Answer: A
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