This document provides an overview of cell structure and organelles. It discusses the organizational levels of cells and criteria for living cells. It describes the plasma membrane and transport mechanisms like diffusion, osmosis, and endocytosis/exocytosis. Key organelles are summarized like the nucleus which controls metabolism and reproduction, cell wall in plant cells, cytoplasm, chloroplasts, chromoplasts, mitochondria, lysosomes, vacuoles, ribosomes, and centrosomes. It also compares prokaryotic and eukaryotic cells and provides some interesting cell facts.