Lactase and carbonic anhydrase are examples of what type of substance?

The answer is enzymes. Enzymes are biological catalysts and increase the speed of change from substrate to product. The name of enzymes is usually derived from the substrate they break down. For example, lactase breaks down sugar lactose. The name of enzymes contains suffix - ase, for instance, carbonic anhydrase, lactase, lipase, amylase, etc ...