So lactose permeates is an example of a symporter, a cotransporter found in E. Coli cell membranes. A structure consists of two six membranespanic, alpha helices, and these are combined to form this simpler. So let's take a look at the following diagram to basically see the general idea of what it actually does. So we have the equalized cell membrane. Let's say this is the outside and this is the inside of the cell. So what these ecoly cells basically do is they break down fuel molecules.