The substance that has a name ending in "-ase" is an enzyme. Enzymes are proteins that act as catalysts in biochemical reactions, playing a crucial role in numerous biological processes in living organisms. They facilitate and accelerate the rate of chemical reactions without being consumed or permanently altered in the process. Enzymes typically have specific substrates they bind to and act upon, increasing the reaction rate and lowering the activation energy required for the reaction to occur.

The "-ase" suffix in enzyme names indicates their catalytic function. Here are a few examples of enzymes with names ending in "-ase":

1. Amylase: This enzyme breaks down complex carbohydrates like starch into simpler sugars like maltose and glucose. It is commonly found in the saliva and pancreas.

2. Lipase: Lipases are responsible for breaking down fats and lipids into fatty acids and glycerol. They play a vital role in the digestion and absorption of dietary fats.

3. Protease: Proteases, also known as proteolytic enzymes, break down proteins into smaller peptide fragments or individual amino acids. They are involved in digestion, protein turnover, and various cellular processes.

4. Cellulase: Cellulases are enzymes that break down cellulose, a complex polysaccharide that forms the primary structural component of plant cell walls. They are essential for the digestion and utilization of plant materials.

5. Lactase: Lactase is an enzyme produced in the small intestine that helps digest the milk sugar lactose into glucose and galactose, which can be absorbed and utilized by the body.

These are just a few examples of many enzymes that have names ending in "-ase." The presence of this suffix often signifies a substance's role as an enzyme involved in catalyzing specific biochemical reactions within living organisms.