3. Adenine and Guanine Purine: Cytosine and Thymine:
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0
Answer:
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4
Answer:
pyrimidine
Explanation:
nitrogenous bases are of two types
purines and pyrimidines
adenine and guanine are purine and have 2 ringed structure
while cytosine , thymine and even uracil are pyrimidines and have single ringed structure.
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