What is molecular biology?

Molecular biology is the scientific discipline that aims to study the processes taking place in living organisms from a molecular point of view.
In its modern sense, molecular biology seeks to explain the phenomena of life from their macromolecular properties. Two macromolecules in particular are the object of study:
1) The nucleic acids, among which the most famous is the deoxyribonucleic acid (DNA), the component genes.
2) Proteins, which are the active agents in living organisms.
Within the Human Genome Project can be found on the following definition Molecular Biology: The study of the structure, function and composition of biologically important molecules.
Molecular biology and other sciences
This area is related to other fields of biology and chemistry, particularly genetics and biochemical engineering. Molecular biology primarily concerns the understanding of the interactions of different cell systems, including many relationships, including the DNA to RNA, protein synthesis, metabolism, and how all these interactions are regulated to achieve proper functioning of the cell.
The difference between organic chemistry and molecular biology or biological chemistry is that biological chemistry DNA molecules have a history and therefore its structure tell us about their history, past which have been established, while an organic molecule, created today is only witness to his present, without past historical evolution