Branching Ivy (English Ivy, Glacier Ivy, Needlepoint Ivy, Sweetheart Ivy, California Ivy) | Scientific Names: Hedera helix | Family: Araliaceae. Bread and Butter Plant (Indian Borage, Spanish Thyme, Coleus, Maratha, Militini, East Indian Thyme) | Scientific Names: Coleus ampoinicus | Family: Labiatae.
The natural substrate for the enzyme cellobiase is cellobiose. This is a disaccharide composed of two beta glucose molecules. However, when scientists study enzyme function, it is best if there is an easy way to detect either the amount of substrate that is used up or the amount of product that is formed.
To form the disaccharide, the OH of one molecule  (such as glucose) bonds to the H in the other OH molecule (such as  glucose, fructose, or galactose). This forms a H2O molecule  (water), and then the excess O forms a bridge between the two  monosachrides; forming a disacaride.