This book aims to elucidate the concepts and recent advances in the fields of molecular and cell biology. Molecular biology is concerned with the study of molecular structures and processes that take place within cells, while cell biology involves the study of physiological properties, structures and functions of cells. It is a compilation of relevant topics such as types of enzyme, protein structures and their functions, metabolic engineering, effect of various substances and factors on cellular activities, etc. which will provide a comprehensive understanding of the subject. Various up-to-date researches and case studies have been included in this book by experts from across the globe that explores the latest developments in these fields. Students, researchers, experts and all associated with molecular cell biology will benefit, alike, from this book.