Oct 7, 2025 · cell, in biology, the basic membrane-bound unit that contains the fundamental molecules of life and of which all living things are composed. A single cell is often a complete …

Cell theory, developed in 1839 by Matthias Jakob Schleiden and Theodor Schwann, states that all organisms are composed of one or more cells, that cells are the fundamental unit of structure …

Cell size Explore how cell size influences structure and function. Understand the scale of cells and the factors that limit their growth. Examine the relationship between surface area and volume, …

Feb 22, 2021 · Cells are the basic building blocks of all living things. The human body is made of trillions of cells that carry out specialized functions.

Learn how cells work together in tissues, organs, and organ systems. In 1665, Robert Hooke coined the term cell to describe the structures he could see in cork with some of the first …

3 days ago · All cells can be sorted into one of two groups: eukaryotes and prokaryotes. A eukaryote has a nucleus and membrane-bound organelles, while a prokaryote does not. …

Cells are the microscopic units that make up living organisms. Learn about the characteristics and structures that all cells have in common.