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WorksheetsAmino Acid Metabolism Quiz
Total questions: 20
Worksheet time: 10mins
Which enzyme converts phenylalanine to tyrosine?
Phenylalanine synthase
Phenylalanine hydroxylase
Tyrosinase
DOPA decarboxylase
Which coenzyme is required for phenylalanine hydroxylase?
NADH
Tetrahydrofolate
Tetrahydrobiopterin
Pyridoxal phosphate
Which metabolic disorder is due to deficiency of phenylalanine hydroxylase?
Alkaptonuria
Albinism
PKU
MSUD
Which compound turns urine black upon standing in Alkaptonuria?
Tyrosine
Phenylalanine
Homogentisic acid
Fumarate
What test is used for detecting phenylketonuria?
FeCl₃ test
Benedict’s test
Ninhydrin test
Millon’s test
Which condition is caused by tyrosinase deficiency?
PKU
Albinism
Alkaptonuria
Hartnup disease
Which amino acid is a precursor for melanin?
Phenylalanine
Tyrosine
Histidine
Serine
Which is NOT a biologically important product of tyrosine?
Melanin
Thyroxine
Serotonin
Adrenaline
BUN stands for?
Basic urea nitrogen
Blood urea nitrogen
Bile urea nitrogen
Basal urine nitrogen
What is a normal range for BUN?
2–6 mg/dL
7–20 mg/dL
25–50 mg/dL
>50 mg/dL
What is the toxic effect of ammonia on CNS?
Hyperactivity
Seizures
Neurotoxicity due to glutamine accumulation
Muscle cramps
Which is a transport form of ammonia in blood?
Urea
Glutamate
Glutamine
Citrulline
One-carbon units are carried by?
Biotin
Tetrahydrobiopterin
THF (tetrahydrofolate)
FAD
Hartnup disease affects transport of which amino acid?
Methionine
Phenylalanine
Tryptophan
Lysine
Which amino acid leads to niacin deficiency in Hartnup disease?
Tyrosine
Tryptophan
Glycine
Serine
Which is a glucogenic amino acid?
Leucine
Lysine
Valine
Isoleucine
Polyamines are synthesized from which amino acid?
Glycine
Arginine
Lysine
Methionine
Which is NOT a polyamine?
Putrescine
Ornithine
Spermidine
Spermine
Function of polyamines includes?
DNA degradation
Protein digestion
Cell growth and proliferation
Blood coagulation
Which intermediate of tyrosine catabolism is excreted in Alkaptonuria?
Fumarate
Homogentisic acid
Succinate
Acetoacetate
