This textbook presents a study of cell structure and function at the molecular level. It includes topics such as enzyme structure and function; gene structure, function, and regulation; cloning; genomics; structure and function of membranes and cell organelles; bioenergetics; signal transduction; and cell cycle control. This volume provides an overview of the basic components comprised within all living things before moving onto to how organisms' internal systems work and how they coexist and contend with external elements. It looks at subjects such as: DNA and RNA; protein structures; and movement along cellular pathways and delves into other molecular biological issues, including those of pathogens; and the formation of cancerous cells.