Molecular biology is the study of biology at a molecular level. The field overlaps with other areas of biology and chemistry, particularly genetics and biochemistry. Doing Biology is an interesting aspect of human study and it involves various unique findings that have paved way for major medical researchers, discoveries and inventions of medicines that are all useful for the health of living beings. Biochemistry, Molecular Biology and Genetics form part and parcel of Biology and are overlapping in their theories and approaches with some minute differences. Molecular Biology tells us about Biology at molecular level. It discusses molecular techniques like cloning, PCR, blotting etc. It primarily concerns understanding how various cellular systems interact in terms of the way DNA, RNA and protein synthesis function. This book offers a complete introduction to biochemistry and molecular biology. It covers both current and traditional areas in biochemistry, with an emphasis on the biological aspects of biochemistry.