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 and …

2025年12月10日 · 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 carry out a …

2 天之前 · 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. Plants and animals are …

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

All living things are made of cells. They are the basic building blocks of life. The human body is composed of trillions of cells, all with their own specialised function.

2025年10月28日 · Cells are the basis of all life on Earth, producing every living organism, from a single cellular bacteria, through to trillions of cells making up a human. All living species on Earth have cells.

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...