Q:Answer the following question given this paragraph: Freely available amino acids are used to create proteins. If amino acids exist in excess, the body has no capacity or mechanism for their storage; thus, they are converted into glucose or ketones, or they are decomposed. Amino acid decomposition results in hydrocarbons and nitrogenous waste. However, high concentrations of nitrogen are toxic. The urea cycle processes nitrogen and facilitates its excretion from the body. Q: What does the urea cycle process? Choices: - calcium - urine - oxygen - nitrogen A:
A:
nitrogen