which one of the following occurs in the urea cycle? group of answer choices carbamoyl phosphate is derived directly from glutamine and co2 ornithine reacts with aspartate to generate argininosuccinate the -amino group of arginine forms one of the nitrogens of urea ornithine directly reacts with carbamoyl phosphate to form cirtrulline n-acetylglutamate is a positive allosteric effector of ornithine transcarbamoylase
