33 比較 De novo purine biosynthesis 及 de novo pyrimidine biosynthesis，下列何者只發生於 De novo purine biosynthesis ？
(A)condensation of the completed purine ring with ribose phosphate
(B)participation of glycine
(C)participation of aspartate
(D)participation of PRPP(phosphoribosyl pyrophosphate)

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統計： A(0), B(2), C(0), D(3), E(0) #866166