Cells are the fundamental units of life. A thorough understanding of the structure, function, and behavior of cells provides a broad insight into how life works. In this course, the basic genetic mechanisms, internal organization, growth, and differentiation of cells are discussed. Fundamental concepts on the (1) structure and regulatory function of biomembranes, (2) intracellular protein sorting and vesicular trafficking, (3) energy conversion in the mitochondrion and chloroplast; (4) cell signaling, (5) cytoskeleton; (6) flow of genetic information; (7) cell cycle and death, and (8) cells in their social context are emphasized.