Question: what is molecular biology

George Makau answered on 28 May 2019:

Molecular biology is the study of life at the level of atoms and molecules. It stands at the crossroads of chemical, biological, physical and computational sciences and focuses on the understanding of cellular processes, biological molecules and their interactions.
Take an earthworm, for example. One can describe the characteristics of the worm, including its size, shape, colour, weight, the foods it eats, and the way it reproduces. A molecular biologist will study the cells of which the earthworm is made. They could identify the structures of which cells are made, the way cells change, the substances needed by the cell to survive, products made by the cell, and other cellular characteristics.
Molecular biology takes this analysis of life one step further. We do so by studying the worm’s genetic code (DNA, RNA) and proteins. Molecular biology attempts to study the molecules of which living organisms are made in much the same way that chemists study any other kind of molecule. For example, they try to find out the chemical structure of these molecules and the way this structure changes during various life processes, such as reproduction and growth. In their research, molecular biologists make use of ideas and tools from many different sciences, including chemistry, biology, and physics.