One of the many remarkable enzymes in the human body is carbonic anhydrase, which catalyzes the interconversion of carbon dioxide and water with bicarbonate ion and protons. If it were not for this enzyme, the body could not rid itself rapidly enough of the CO₂ accumulated by cell metabolism. The enzyme catalyzes the dehydration (release to air) of up to 10⁷ CO₂ molecules per second. Which components of this description correspond to the terms enzyme, substrate, and turnover number?