Biochemistry is a branch of science that is concerned with the study of chemicals substances that makes up living organisms.
Biochemistry aims at the analysis of the changes that occurs in the chemical molecules that makes up all living organisms. It determines the specific adaptive features that the different macromolecules and micromolecules have that contribute to their specific functions.
This information about specialization of chemicals in terms of functionality helps to determine the evolutionary relationships between different chemicals that tend to be close. Examples of such chemicals are nucleic acids and proteins which contain some substances that are similar in structure owing to their same origin.