Lactase and carbonic anhydrase are examples of what type of substance?
a. substrate
b. reactant
c. product
d. enzyme

Lactase and carbonic anhydrase are examples of an enzyme. Enzyme by definition, is a chemical substance in plants and animals that helps in causing natural process. Lactase is an enzyme that hydrolyzes galactosides and occurs in intestines of young mammals and in yeasts.

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definition

                    entropy is a measure of the randomness or the extent of disorder of a chemical process.

                      enthalpy is a measure of the heat change of a reaction occurring at a constant pressure.

measurement units:

                        entropy is measured in joule per kelvin (jk⁻¹)   whereas enthalpy is measured in joule per mole (jmol⁻¹)

requirements:

                            entropy has no requirements or limits, and its change is measured by the division between the heat change of the chemical process and the temperature.

                              in contrast, enthalpy can only be related to the heat change of the reaction under standard conditions.