What is the difference between a Biochemist and a Molecular biologist?

Answer 1

Biochemist
A biochemist is a scientist trained and dedicated to producing results in the discipline of biochemistry. Typically biochemists study chemical processes and chemical transformations in living organisms

M biologist
Molecular biology is the study of biology at a molecular level. The field overlaps with other areas of biology and chemistry, particularly genetics and biochemistry. Molecular biology chiefly concerns itself with understanding the interactions between the various systems of a cell, including the interrelationship of DNA, RNA and protein synthesis and learning how these interactions are regulated

Answer 2

at a university, a biochemist will be in the department of chemistry, and a molecular biologist will be in the department of biology. other than that there's not a lot of difference. see also: chemical physicist vs. physical chemist.