________ is hydrolytically cleaved to directly yield urea in the urea cycle.
A) Ornithine
B) Glutamate
C) Arginine
D) Carbamoyl phosphate
Correct Answer:
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Q47: Birds and many land reptiles convert surplus
Q48: In mammals,ureagenesis occurs almost exclusively in the
Q49: The glucose-alanine cycle provides _.
A)an alternate site
Q50: The enzyme _ is one of the
Q51: Which type of organisms can eliminate excess
Q53: The carbon in urea originates from _.
A)aspartate
B)ornithine
C)bicarbonate
D)ATP
Q54: Phenylalanine hydroxylase requires molecular _ and tetrahydrobiopterin.
A)hydrogen
B)nitrogen
C)water
D)oxygen
Q55: The glucose-alanine cycle provides a mechanisms for
Q56: Which of the following supplies a nitrogen
Q57: In mammals,most amino acids undergo deamination in
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