The book is a choice selection of exciting topics in molecular biology organized in a logical sequence starting with a historical and biochemical background, progressing through the structure and functions of nucleic acids, the role of nucleic acids in protein synthesis (including transcription and translation of genetic information) and culminating in a concise account of our current knowledge about genes and genomes. While the close interlinkages amongst cell biology, biochemistry and molecular genetics in weaving the fabric of general molecular biology can be seen throughout the book, the electron microscopic aspects, usually termed supramolecular biology, have been avoided so as to enhance utility of the text for students in developing countries including India. The textbook has a glossary of useful terms and a list of recent books and papers for supplementary reading and reference. A short summary of some important points and rules of molecular biology is given at the end of each chapter for quick reference.