Thats a good question Gbleem and one that this page unfotunately does not address The definition of biochemistry as a study only concerned with the molecules in living systems is simply false Both molecular biolgists and biochemists examine the intricacies of life processes and both devote their efforts to the component molecules of these processes as well as the holistic bigpicture in which they function To say that biochemistry is somehow more focused on the small scale is a lie Lets face it the fields of molecular biology biochemistry and genetics all share  a considerable amount overlap and report on this fact here as opposed to needlessly pigeonholing biochemists