This book explains the essential principles, processes and methodology of cell biology, biochemistry and molecular biology. It reflects upon the significant advances in cell biology such as motor proteins, intracellular traffic and targeting of proteins, signalling pathways, receptors, apoptosis, aging and cancer. it also discusses certain current topics such as history of life (origin of life), archaebacteria, split genes, exon shuffling, gene silencing, RNA interference, miRNA, siRNA and recombinant DNA technology, etc.