Microbial Biochemistry is the branch of medical Science which explains about the chemical processes that takes place in microorganisms like bacteria, virus, fungi and some algae. It deals with structures, functions and interactions of biological macromolecules, like carbohydrates, proteins, lipids and nucleic acids within the microorganism. It has been recently found that the methane oxidizing bacteria are capable of reducing greenhouse gas by consuming hydrogen gas to enhance their growth and survival.