Sign In Question: Adenine and guanine are – (RJ AARO Botany 2022)
✅ Explanation: Adenine and guanine are nitrogenous bases classified as purines due to their double-ring structure.
📌Other Options Explanations:
-Option B: Pyrimidine bases (e.g., cytosine, thymine, uracil) have a single-ring structure.
-Option C: Sugars are components of nucleic acids.
-Option D: Uric acid is a waste product of purine metabolism.
🔑Key Points:
-Nucleic acids (DNA & RNA) are made of nucleotides, which consist of a phosphate group, a sugar (deoxyribose in DNA and ribose in RNA), and a nitrogenous base.
-Nitrogenous bases are divided into purines (adenine, guanine) and pyrimidines (cytosine, thymine, uracil).
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