Why must nitrogen be removed from amino acids before their carbon skeletons can be used in the citric acid cycle?

What occurs during the formation of citrulline in the mitochondria?

What are the products of argininosuccinate cleavage in the urea cycle?

Which metabolic cycle utilizes amino acid carbon skeletons for energy production?

What is the ATP cost associated with the formation of carbamoyl phosphate in the urea cycle?

What is the significance of the phosphate group in the formation of citrulline from ornithine and carbamoyl phosphate?

What is the fate of ornithine after urea is formed from arginine in the urea cycle?