1) In amino acid catabolism, the first reaction for many amino acids is a(n): a)

ID: 831031 • Letter: 1

Question

1) In amino acid catabolism, the first reaction for many amino acids is a(n):

a) decarboxylation requiring thiamine pyrophosphate (TPP).

b) hydroxylation requiring NADPH and O2.

c) oxidative deamination requiring NAD+.

d) reduction requiring pyridoxal phosphate (PLP).

e) transamination requiring pyridoxal phosphate (PLP).

2) The conversion of glutamate to an ?-ketoacid and NH4

a) does not require any cofactors.

b) is a reductive deamination.

c) is accompanied by ATP hydrolysis catalyzed by the same enzyme.

d) is catalyzed by glutamate dehydrogenase.

e) requires ATP.

3) Urea synthesis in mammals takes place primarily in tissues of the:

a) brain.

b) kidney.

c) liver.

d) skeletal muscle.

e) small intestine.

4) Which of these directly donates a nitrogen atom for the formation of urea

during the urea cycle?

a) Adenine

b) Aspartate

c) Creatine

d) Glutamate

e) Ornithine

5) Which of the following amino acids are essential for humans?

a) Alanine

b) Aspartic acid

c) Asparagine

d) Serine

e) Threonine

5 E Threonine

4B Aspartate

3C liver

2 D is catalyzed by glutamate dehydrogenase

1E transamination requiring pyridoxal phosphate (PLP).

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