25. Protein and Amino Acid Metabolism

Which one of the following sentences is an incorrect description of a reaction in the urea cycle?

Which amino acid provides the NH₄⁺ for the formation of carbamoyl phosphate?

Write the total number of amino acid metabolites in the urea cycle. How many of those amino acids are not found in proteins?

Which enzyme catalyzes the reaction of citrulline with aspartate to produce argininosuccinate?

Which of the following metabolites is hydrolyzed in the urea cycle to produce ornithine and urea?

Which of the following amino acids is not a part of the urea cycle?

What is the function of aspartate in the urea cycle?