Final answer:
The process of dehydrogenation does not produce free ammonia, making it the correct answer to which process listed does not yield free ammonia in contrast to deamination and transamination. The correct answer is option b.
Step-by-step explanation:
The question pertains to the metabolic pathways that involve nitrogen compounds in biological systems. Specifically, it is inquiring about which processes do not produce free ammonia (NH3). The processes are:
- Deamination: This is the removal of an amino group from amino acids, converting them into keto acids and, importantly, free ammonia.
- Dehydrogenation: This is a chemical reaction that involves the removal of hydrogen (not nitrogen) from a molecule, and it does not result in the release of ammonia.
- Transamination: It involves the transfer of an amino group from one amino acid to a keto acid, and does not release ammonia directly.
Given these definitions, it is clear that dehydrogenation does not yield free ammonia. Therefore, the correct option is (b) dehydrogenation.