Metabolism of Nitrogen Quiz

What is the primary aim of the Urea cycle?

• Synthesise glucose

• Form porphyrins

• Metabolise NH4+

• Produce ketone bodies

Which enzyme is responsible for the conversion of excess ammonia to glutamine?

• Glutaminase

• Aminopeptidase

• Pepsin

• Trypsin

What is the main function of the urea cycle?

• Produce ATP

• Synthesise proteins

• Metabolise amino acids

• Excrete urea

What is the result of the catabolism of purines?

• Formation of ketone bodies

• Production of porphyrins

• Conversion to uric acid

• Synthesis of neurotransmitters

Which amino acid is exclusively ketogenic?

• Leucine

• Lysine

• Tryptophan

• Phenylalanine

What is the primary cause of gout?

• Conversion of excess ammonia to glutamine

• Deficiency of niacin

• Excess uric acid in the bloodstream

• Overproduction of porphyrins

What is the main function of the enzyme glutamine synthetase?

• Converts ammonia to urea

• Synthesises neurotransmitters

• Converts excess ammonia to glutamine

• Breaks down amino acids

What is the result of the catabolism of pyrimidines?

• Formation of ketone bodies

• Synthesis of neurotransmitters

• Conversion to uric acid

• Conversion to CoA derivatives

What is the primary function of the enzyme glutaminase?

• Breaks down amino acids

• Converts excess ammonia to glutamine

• Synthesises neurotransmitters

• Converts ammonia to urea

Pepsin and Trypsin digest proteins in the small intestine.

• True

• False