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(a) Identify the structural features of purines and pyrimidines. (Check two features for each group). for each group). Nap, Purines Pyrimidines: □ □ □ contain one heterocyclic ring contain two heterocyclic rings contain only two ring nitrogens contain only three ring nitrogens contain four ring nitrogens contain one heterocyclic ring contain two heterocyclic rings contain only two ring nitrogens contain only three ring nitrogens contain four ring nitrogens □ □ (b) Classify each of the following molecules as a purine or a pyrimidine Purines Pyrimidines NH2 thymine NH guanine uracil

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O furines : Contain tuoo hebvrocydlic rings 2) Contain four ring nitrogen Pyrimi diner1 Contain one heterocyeke rins 2) Conta

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