Dec 1, 2025 · Usually microscopic in size, cells are the smallest structural units of living matter and compose all living things. Most cells have one or more nuclei and other organelles that …

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 …

An introduction to cells, including the history of their discovery and the development of cell theory.

1 day 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.

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.

Some cells are organisms unto themselves; others are part of multicellular organisms. All cells are made from the same major classes of organic molecules: nucleic acids, proteins, carbohydrates...

Cells are the basic structures of all living organisms. Different cells have different functions – such as taking in nutrients from food, providing structure for the body, or fighting infection.

Aug 21, 2025 · In biology, a cell is the fundamental structural and functional unit of all living organisms. They are basic membrane-bound units that contain the necessary molecules of …

Oct 15, 2025 · Our bodies contain trillions of cells. In this article, we explain what they are and what happens inside. We also describe some of the many types of cells.