So we have a bond between carbon 104, but because this points up, not downward, this is the beta arrangement. And so we have the beta one four glycocitic bond. Now, in humans, we also have an enzyme, or at least most people have an enzyme known as lactase that breaks down this lactose into the individual constituents, galactose and glucose. In bacterial cells, the enzyme is called beta galactose, sedase. And so these two enzymes are responsible for breaking down this same energy source in different organisms, one in humans and the other in bacterial cells. And finally, let's take a look at sucrose.