Final answer:
A biochemical term ending in '-ase' usually refers to an enzyme, which is a protein that acts as a catalyst in biochemical reactions. Enzymes are specific to their substrates and can be involved in breaking down or synthesizing larger molecules.
Step-by-step explanation:
When you see a biochemical term that ends in -ase, it usually refers to an enzyme. Enzymes are special protein molecules that act as catalysts in biochemical reactions by lowering the activation energy needed for reactions to proceed. They are incredibly specific, meaning that each enzyme is tailored to act on a particular molecule, known as the substrate. For example, the enzyme sucrase catalyzes the hydrolysis of sucrose into glucose and fructose. Enzymes like pepsin and papain, which do not end in -ase, were named before this nomenclature convention was established.
Different types of enzymes include enzymes that break down their substrates, known as catabolic enzymes, and those that build more complex molecules, known as anabolic enzymes. Regardless of their specific function, all enzymes act as organic catalysts, increasing the rate of chemical reactions without being consumed in the process.