Please let me know if this explanation/description makes sense and is missing any pertinent details....(i feel like something's not right here) Okay, when proteins are used as fuel in cellular respiration, it is first hydrolyzed into their amino acids. Most of these amino acids will be used by the cell to make its proteins. Excess amino acids will be converted to other organic cpds. When being converted to other organic cpds., the amino groups are used to make other cpds. or disposed in urine. The leftover part of the amino acid now without the amino group are converted to intermediates in cellular respiration. Does that sound about right?