Protein Metabolism Quiz

Which enzyme is responsible for the breakdown of proteins into polypeptides & few amino acids in the stomach?

• Aminopeptidase

• Pepsin

• Glutamate dehydrogenase

• Trypsin

What is the main mechanism for deamination of amino acids?

• Oxidative Deamination

• Transdeamination

• All of the above

• Transamination

Where is urea synthesized in the body?

• Kidneys

• Liver

• Intestines

• Lungs

What is the main function of S-adenosyl methionine (SAM)?

• Methyl donor for transmethylation reactions

• Synthesis of catecholamines

• Synthesis of creatine phosphate

• Synthesis of glutamine

Which amino acid is essential while the other is non-essential and can be formed from the essential one?

• Methionine & Glutamate

• Glutamine & Creatine

• Phenylalanine & Tyrosine

• Glycine & Cysteine

What is the main function of glutathione?

• Detoxification of ammonia

• Powerful antioxidant

• Synthesis of proteins

• Synthesis of urea

Which amino acid undergoes rapid oxidative deamination by glutamate dehydrogenase?

• Glutamic acid

• Methionine

• Glutamine

• Phenylalanine

What is the main pathway for disposal of ammonia in the body?

• Glycolysis

• Krebs cycle

• Urea cycle

• Calvin cycle

What is the condition characterized by elevated plasma level of ammonia?

• Hypoglycemia

• Hypertension

• Hyperammonemia

• Hyperglycemia

Which amino acid is a precursor for the synthesis of thyroid hormones?

• Tyrosine

• Glutamine

• Methionine

• Phenylalanine