In ureotelic animals, carbamoyl group are transferred to:-
The question is asking about the first step of the urea cycle in an indirect way (See Fig). Based on how nitrogen is excreted, animals are divided into 3 categories. Ammoniotelic animals - Animals that excrete ammonia. e.g. Fishes Ureotelic animals - Animals which excrete urea e.g. Mammals including man Uricotelic - Animals that excrete uric aciduric acid. e.g. Birds
Urea
Uric acid
Ornithine
Creatine
Urea cycle