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 …

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 …

Oct 15, 2025 · A cell is the smallest living organism and the basic unit of life on earth. Together, trillions of cells make up the human body.

All cells evolved from a common ancestor and use the same kinds of carbon-based molecules. Learn how cell function depends on a diverse group of nucleic acids, proteins, lipids, and sugars.

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.

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

Apr 7, 2025 · At the most fundamental level, a cell consists of a cell membrane, cytoplasm, and genetic material (DNA or RNA). The cell membrane is a semi-permeable barrier that regulates …

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. …

How many cells does a human have? Why is the cell the structural and functional unit of life? Who discovered the cell? Who discovered the nucleus? What is cell theory? What’s inside a cell? …

Cells are the basic structural, functional, and biological units of all living organisms. They serve as the building blocks of life, capable of carrying out essential processes such as metabolism, …