Biology

Articles about living organisms, life processes and biological research.

Articles in this category: 1554 Updated: April 29, 2026 Page 6 / 33

Cell nucleus

Cell nucleus: structure, function, and biological significance

Cell theory

The Cell Concept: Principles, History, and Modern Refinements

Cell wall

Cellular respiration

Cellular respiration: how cells convert nutrients into ATP

Central dogma of molecular biology

Central nervous system

Centriole

Centrosome

Centrosome (animal cell microtubule-organizing center)

Cephalothorax

Cerebellum

Cerebellum: structure, function, development, and clinical significance

Cerebral cortex

Cerebral cortex: structure, function, development, and clinical significance

Cerebrospinal fluid

Cerebrum

Cerebrum: structure, function, and clinical significance

Cervix

Cervix: structure, function, and clinical importance

Cetology

Cetology: the study of whales, dolphins and porpoises

Cheek

Chemoautotroph

Chemoautotrophs: organisms that build biomass from inorganic chemicals

Chimaera (genetics)

Chimaera (genetics): organisms composed of genetically distinct cell lines

Chlamydia (bacterium)

Chlamydia (genus of bacteria)

Chlamydia trachomatis

Chlamydia trachomatis: biology, clinical disease, diagnosis and prevention

Chlamydiae

Chlamydiae: obligate intracellular bacteria – biology, life cycle, and significance

Choanoflagellate

Choanoflagellates: collar-bearing unicellular and colonial eukaryotes

Chromalveolate

Chromalveolate (Chromalveolata): concept, members, and classification issues

Chromatid

Chromatin

Chromatophore

Chromosome

Chromosome

Chromosome: structure, function, and biological significance

Chromosomes are DNA–protein complexes in the nuclei of eukaryotic cells that package genes, enable inheritance, and play central roles in cell division, development and genetic var

Chromosome inversion

Chytridiomycota

Chytridiomycota: the chytrid fungi — features, ecology, and significance

Cilia

Cilia

Cilia: structure, function, and biological importance

Cilia are hairlike projections on eukaryotic cells that enable movement, fluid flow, and sensing. This article explains their structure, types, roles, history, and clinical relevan

Ciliate

Circadian rhythm

Circadian Rhythm: The Biological Clock Regulating Daily Physiology

Circulatory system

Circulatory system (cardiovascular system)

Cladistics

Cladistics: principles, methods, and applications

Class (biology)

Clavicle

Cleidoic egg

Climax community

Cline

Cline (biology) — Gradients of variation across populations

Clitoris

Cloaca

Cloaca: single posterior chamber for excretion and reproduction in vertebrates

Clone

Clone: biological and genetic copies

Clostridia

Clostridia: anaerobic, spore-forming bacteria of medical and ecological importance

Clostridium

Clostridium: overview of the genus, traits, diseases and uses

Clostridium perfringens

Cnida

Cnida — the stinging organelles of Cnidaria

Coagulation

Coccidia

Coccidia: microscopic apicomplexan parasites