(NH2)2CO + 3H2O → CO2 + 2NH4OH
In 1926 James Sumner[?] shows that urease is a protein. Urease is found in bacteria, yeast and several higher plants.
Characteristics:
... the square" is to add a constant (i.e., in this case, a quantity that does not depend on x) to the expression to the left of "=", that will make it a perfect square ...