define molecular biology
Molecular biology: The study of biology on a molecular level including the structure, function, and makeup of biologically important molecules such as DNA, RNA, and proteins. The field of molecular biology involves many other areas of biology such as biochemistry and genetics.
genetics. 1. Biology. the science of heredity, studying resemblances and differences in related organisms and the mechanisms which explain these phenomena. 2. the genetic properties and phenomena of an organism. — geneticist, n. — genetic, adj. the branch of biology that studies heredity and variation in plants and animals.