In this step of purine biosynthesis, which functional group gets activated by ATP Pribose NH3 ATP Carboxyaminomidazole ribonedeotide Asp ADP Fumarate Pribose S-Aminolmidazole- 4(N-succinylcarboxamide) ribonucdeotide O Carboxyaminoimidazole ribonucleotide COOH O Carboxyaminoimidazole ribonucleotide NH2 O Asp side chain COOH O Asp main chain NH2 O Asp main chain COOH

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