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

I believe the correct answer from the choices listed above is the last option. Lactase and carbonic anhydrase are examples of enzymes. Lactase is an enzyme produced by a lot of organisms. Carbonic anhydrases, on the other hand, is a family of enzymes that catalyze the rapid interconversion of CO2 and H2O to bicarbonate.

It's an allele not a chromosome