(a)[7]
Describe the route followed by one molecule of urea, from the liver of a mammal until it gets to the soil.
(b)[3]
Urea is a molecule containing nitrogen. Suggest why it matters that nitrogen-containing molecules are added to the soil.
Biology 5090 · O Level · Nutrient cycles
Nutrient cycles — practice question
In liver cells, excess amino acids are broken down to make urea molecules.