Cellular biology is the study of cells, which are the basic building blocks of all living organisms. Cells come in various shapes and sizes, and they perform essential functions that keep organisms alive. For example, plant cells have a rigid cell wall, while animal cells do not. Understanding how cells work helps scientists learn about growth, reproduction, and how diseases like cancer develop. In cellular biology, researchers explore the different parts of a cell, such as the nucleus, which contains genetic material, and mitochondria, known as the powerhouse of the cell. By studying these components, scientists can uncover how cells communicate, respond to their environment, and maintain their health.