So we see that isozymes are proteins that carry out the same type of biochemical process, but have slightly different amino acid sequences and slightly different structures. And so because of that, they display slightly different properties. For instance, they might have different mechanics, constant values, they might have different turnover numbers and so forth. Now these is allow our body to actually fine tune these regulatory pathways to actually meet the needs and demands of all different types of cells that exist inside our body. Now, what I'd like to focus on in this lecture is the biochemical process by which we actually bring the glucose molecules into the cells of our body. So remember, glucose molecules have many polar groups, they have many hydroxyl groups, and that makes glucose a polar molecule.