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 …

Dec 10, 2025 · What is a cell? A cell is a mass of cytoplasm that is bound externally by a cell membrane. Usually microscopic in size, cells are the smallest structural units of living matter …

Jun 14, 2025 · Explore the structure, types, and functions of cells in this student-friendly guide to cell biology and cell theory.

Cells fall into one of two broad categories: prokaryotic and eukaryotic. The predominantly single-celled organisms of the domains Bacteria and Archaea are classified as prokaryotes (pro- = …

Aug 1, 2025 · Understanding these structures is fundamental to grasping how all living organisms function. Living organisms are broadly classified into two primary cell categories: prokaryotic …

2 days ago · What Is a Cell? A cell is a tiny compartment surrounded by a membrane. Inside it, numerous activities occur constantly — producing energy, storing information, making …

3 days ago · A cell is the smallest, fundamental unit of life and is responsible for all life's functions. It is the basic biological, structural, and functional components of all living things.

From organelles to membrane transport, this unit covers the facts you need to know about cells - the tiny building blocks of life. Explore the structures and functions of major eukaryotic cell …

There are many different types, sizes, and shapes of cells in the body. For descriptive purposes, the concept of a "generalized cell" is introduced. It includes features from all cell types. A cell …

Oct 15, 2025 · Cells are the basic units of life. The body contains trillions of cells, which vary widely in size, number, structure, and function. Cells also communicate with each other. …