Cell | Definition, Types, Functions, Diagram, Division, Theory, & Facts ...
Mar 17, 2026 · A cell, in biology, is the basic membrane-bound unit that contains the fundamental molecules of life and of which all living things are composed. A single cell may be a complete …
Cell cycle | Description, Stages, & Checkpoints | Britannica
Mar 26, 2026 · Cell cycle, the ordered sequence of events that occur in a cell in preparation for cell division. The cell cycle is a four-stage process in which the cell increases in size, copies its DNA, …
Cell - Mitosis, Cytokinesis, Prokaryotes | Britannica
Mar 17, 2026 · Cell - Mitosis, Cytokinesis, Prokaryotes: In unicellular organisms, cell division is the means of reproduction; in multicellular organisms, it is the means of tissue growth and maintenance. …
Cellular respiration | Definition, Equation, Cycle, Process, Reactants ...
Feb 19, 2026 · Cellular respiration, the process by which organisms combine oxygen with foodstuff molecules, diverting the chemical energy in these substances into life-sustaining activities and …
Cell - Differentiation, Organelles, Cytoplasm | Britannica
Mar 17, 2026 · Cell - Differentiation, Organelles, Cytoplasm: Differentiation from visibly undifferentiated precursor cells occurs during embryonic development, during metamorphosis of larval forms, and …
Mitosis | Definition, Stages, Diagram, & Facts | Britannica
Mar 20, 2026 · Mitosis, a process of cell duplication, or reproduction, during which one cell gives rise to two genetically identical daughter cells. Strictly applied, the term is used to describe the duplication …
Definition, Function, Structure, & Facts - Britannica
Mar 25, 2026 · Mitochondrion, organelle found in most eukaryotic cells, the primary function of which is to generate energy in the form of adenosine triphosphate. Mitochondria also store calcium for cell …
Genetic engineering | Definition, Process, Uses, Examples, Techniques ...
Apr 2, 2026 · Genetic engineering is the artificial manipulation, modification, and recombination of DNA or other nucleic acid molecules to modify an organism. The term is generally used to refer …
Phagocytosis | Definition, Process, & Examples | Britannica
Phagocytosis is the process by which cells known as phagocytes ingest or engulf other cells or particles. Phagocytes may be free-living single-celled organisms, such as amoebas, or body cells, such as …
Meiosis | Definition, Process, Stages, & Facts | Britannica
Mar 30, 2026 · Meiosis is a specialized type of cell division in germ cells that consists of two successive nuclear divisions, producing four genetically distinct haploid cells (gametes, or sex cells), each …