Phenylalanine hydroxylase requires molecular ________ and tetrahydrobiopterin.
A) hydrogen
B) nitrogen
C) water
D) oxygen
Correct Answer:
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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
Q52: _ is hydrolytically cleaved to directly yield
Q53: The carbon in urea originates from _.
A)aspartate
B)ornithine
C)bicarbonate
D)ATP
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
Q58: In the urea cycle which molecule is
Q59: Which amino acids are purely ketogenic?
A)Arginine and
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