30 Questions
What is formed when Aspartate loses its amino group by transamination?
Oxaloacetate
Which enzyme is responsible for converting Glutamine to Glutamate?
Glutaminase
What is the product of the reaction where Proline is oxidized?
Glutamate
What is the role of Arginase in the metabolism of Arginine?
To cleave Arginine to produce Ornithine
What is the intermediate formed when Asparagine is broken down?
Aspartate
What is the end product of the transamination of Glutamate?
α-ketoglutarate
What is the product formed when ornithine is converted by ornithine aminotransferase?
α-ketoglutarate
What is the product formed when histidine is oxidatively deaminated by histidase?
Urocanic acid
What is the product formed when glycine is converted by serine hydroxyl methyltransferase?
Serine
Which enzyme is responsible for the conversion of cystine to cysteine?
Cystine reductase
What is the product formed when phenylalanine is hydroxylated?
Tyrosine
What is the end product of the metabolism of phenylalanine and tyrosine?
Fumarate and acetoacetate
Where does the major site of amino acid degradation occur in mammals?
Liver
What is one of the main ways nitrogen leaves the body?
Urea
What are the two types of amino acids based on their catabolism?
Glycogenic and Ketogenic
What are the resulting products of amino acid catabolism?
Urea, Ammonia, and Energy
Which of the following amino acids are exclusively ketogenic?
Leucine and Lysine only
What is the name of the cycle involved in amino acid catabolism?
Urea cycle
Which enzyme is deficient in Phenylketonuria?
Phenylalanine hydroxylase
What is the primary site of metabolism for branched chain amino acids?
Muscle
Which of the following amino acids is exclusively ketogenic?
Lysine
What is the byproduct of threonine catabolism via threonine aldolase?
Acetaldheyde and glycine
Which of the following amino acids can be both glucogenic and ketogenic?
Tryptophan and Threonine
What is the byproduct of leucine catabolism?
Acetyl CoA and acetoacetate
What is the product of the reaction where acetaldheyde is oxidized?
Acetate
What is the function of S-adenosylmethionine (SAM) in metabolism?
A methyl group donor in one carbon metabolism
What happens to homocysteine in case of methionine deficiency?
It is remethylated to form methionine
What is the product of the reaction where homocysteine condenses with serine?
Cystathionine
What is the enzyme responsible for converting homocysteine to cystathionine?
Cystathionine β-synthetase
What is the result of a deficiency in cystathionine β-synthetase?
Homocystinuria
Test your knowledge of amino acid catabolism, including the major sites of degradation, the role of the liver, and the products of amino acid catabolism. This quiz covers the basics of nitrogen metabolism and amino acid breakdown.
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