Question

lactase and carbonic anhydrase are examples of what type of substance?
substrate
reactant
product
enzyme

Explanation:

Lactase and carbonic anhydrase are biological catalysts. Enzymes are proteins (or in some cases, RNA - molecules) that catalyze chemical reactions in living organisms. Substrates are the substances upon which enzymes act, reactants are substances involved in a chemical reaction before the reaction occurs, and products are the substances formed after the reaction. Lactase and carbonic anhydrase fit the definition of enzymes.

Answer:

D. enzyme