Biochemistry is the study of the chemistry of living things. This includes organic molecules and their chemical reactions. Most people consider biochemistry to be synonymous with molecular biology. Biochemistry today has made spectacular progress in unraveling the mysteries of animate nature. This progress has allowed us to gain deeper insight in to the principles of vital activity and has to a very significant stimulated the development of applied disciplines, especially medicine. The cell wall serves a similar purpose in those organisms that possess them. The wall gives cell rigidity and strength, offering protection against mechanical stress. In multicellular organisms, it permits the organism to build and hold its shape. The cell wall also limits the entry of large molecules that may be toxic to the cell. it further permits the creation of a stable osmotic environment by preventing osmotic lysis and helping to retain water. The composition, properties, and from of the cell wall may charge during the cell cycle and depend on growth conditions. Biochemistry is a chemistry focused course. Molecular Biology is a Genetics focused course. Biochemistry has to do with the chemical reactions that happen within the body. molecular Biology focuses more on the structure and relationship between four molecules in the body. Molecular biology can cover other topics like microbiology and PCR whereas Biochemistry is related to things like nutrition and enzyme deficiency. This book contains the fundamental and basic information of subject and the selection of contents makes it an appropriate book for the students.