Essential Biochemistry - Nucleic Acid Metabolism (Section 3 - No. 32)
Which of the following is NOT a purine nucleotide?
Adenine
Guanine
Cytosine
Hypoxanthine
Explanation
Cytosine is a pyrimidine base, not a purine base. Adenine, Guanine, and Hypoxanthine are all purine bases found in nucleotides.
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