Chapter 2, Problem 5R

Bacteria use the enzyme urease to obtain nitrogen in a form they can use from urea in the following reaction:

$\underset{\text{Urea}}{{\text{CO(NH}}_{\text{2}}{\text{)}}_{\text{2}}}+{\text{H}}_{\text{2}}\text{O}\to \underset{\text{Ammonia}}{{\text{2NH}}_3}+\underset{\begin{array}{l}\text{Carbon}\\ \text{dioxide}\end{array}}{{\text{CO}}_{\text{2}}}$

What purpose does the enzyme serve in this reaction? What type of reaction is this?