What is biochemistry, and how does it differ from the fields of genetics, biology, chemistry, and molecular biology?

Biochemistry is the study of structure, function, composition and chemical reactions in living organisms. It combines different knowledge from different areas in science.

• In genetics, traits of heredity are studied through proteins and  amino acids rather than studying them on a chemical depth as in biochemistry.
• Biology is the study of all living organisms and includes their origin, function, structure and evolution. It is also a more broad study of living things where as biochemistry is concentrated. 
• Chemistry is the study of elements, molecular compounds, and their structure and characteristics. It differs from biochemistry in such that biochemistry focuses on the structural organization in the human body. 
• Molecular biology is the study of biology at a molecular level. It overlaps with other areas of biology including biochemistry.