Biochemical catalysts are molecules that speed up chemical reactions in living organisms. ENZYME is a 6-letter word for a type of protein that acts as a catalyst in biochemical reactions. Oxidase is a 7-letter word for an ENZYME that catalyzes the oxidation of other molecules. LIPID is a 5-letter word for a type of organic compound that includes fats, oils, and waxes. Sterol is a 6-letter word for a type of LIPID found in animal cell membranes. Ribose is a 6-letter word for a type of sugar found in RNA molecules.