50. Which description is NOT correct about the nitrogen excretion?
(A) Ammonia is highly toxic to animal tissues.
(B) In the urea cycle, ornithine combines with ammonia and regenerate in each turn of the cycle.
(C) The urea cycle results in a net conversion of fumarate to oxaloacetate.
(D) Both of fumarate and oxaloacetate are intermediates in the TCA cycle.
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