20. What is the central pathway in nitrogen metabolism?
(A) Citric acid cycle
(B) Calvin cycle
(C) Cori cycle
(D) Urea cycle
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統計: A(0), B(0), C(0), D(4), E(0) #2769018
統計: A(0), B(0), C(0), D(4), E(0) #2769018