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That's 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 big-picture in which they function. To say that biochemistry is somehow more focused on the small scale is a lie. Let's 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 pigeon-holing biochemists."