24. One amino acid directly involved in the purine biosynthetic pathway is:
(A)alanine.
(B) aspartate.
(C)glutamate.
(D)leucine.
(E) tryptophan

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統計： A(0), B(2), C(0), D(0), E(0) #3175908

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#6018393
 One amino acid dire...
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