Molecular biology is the study of the structure and function of biological molecules, such as proteins, nucleic acids, and carbohydrates. It is a subfield of biology that focuses on understanding the interactions between these molecules and how they affect biological processes. Molecular biology techniques are used to study gene expression, gene regulation, and protein structure and function. By understanding how these bio molecules interact, researchers can better understand how cells and organisms work. In addition, molecular biology techniques are used to engineer new bio molecules for use in biotechnology, medicine, and other applications.