What type of biomolecule produces ammonia through deamination in the liver?

Proteins are the type of biomolecule that produces ammonia through the process of deamination in the liver. During metabolism, proteins are broken down into their constituent amino acids. When these amino acids are deaminated, the amine group (-NH2) is removed, resulting in the formation of ammonia (NH3) as a waste product. This process is crucial because ammonia is toxic to the body, so the liver converts it to urea through the urea cycle, allowing for safe excretion through urine.

In contrast, carbohydrates, nucleic acids, and lipids do not undergo deamination. Carbohydrates are primarily broken down into simple sugars, nucleic acids into nucleotides, and lipids into fatty acids and glycerol. Therefore, while all these biomolecules are essential for various metabolic processes, only proteins lead to ammonia production via deamination in the liver.