They are ammonia, urea, uric acid, and creatinine. All of these substances are produced from protein metabolism. In many animals, the urine is the main route of excretion for such wastes; in some, it is the feces.
EXAMPLES:
The processes of making and breaking down glucose molecules are both examples of metabolic pathways. A metabolic pathway is a series of connected chemical reactions that feed one another. ... In contrast, cellular respiration breaks sugar down into smaller molecules and is a "breaking down," or catabolic, pathway.
Answers & Comments
ANSWER:
They are ammonia, urea, uric acid, and creatinine. All of these substances are produced from protein metabolism. In many animals, the urine is the main route of excretion for such wastes; in some, it is the feces.
EXAMPLES:
The processes of making and breaking down glucose molecules are both examples of metabolic pathways. A metabolic pathway is a series of connected chemical reactions that feed one another. ... In contrast, cellular respiration breaks sugar down into smaller molecules and is a "breaking down," or catabolic, pathway.