Biology

Deuterostome

Deuterostomes

Developmental biology

Developmental Biology: Growth, Patterning, and Differentiation in Living Organisms

Diapause

Diapause: adaptive developmental arrest in animals

Diaphragm

Diaphragm (mammalian respiratory muscle)

Diastole

Diastole: the heart's relaxation and filling phase — physiology and clinical importance

Diatom

Diatom — silica-walled algae central to aquatic ecosystems

Dickinsonia

Dickinsonia — an Ediacaran organism and its place in early multicellular life

Dictyostelid

Dictyostelids (cellular slime molds)

Differences between butterflies and moths

Digestion

Digestion: How the Body Breaks Down, Absorbs and Uses Food

Digestive system

Digestive system: structure, function, and clinical relevance

Dinoflagellate

Dinoflagellates: biology, ecology, and significance

Dinosauromorpha

Dinosauromorpha — the dinosaur lineage and its close relatives

Diplura

Directed evolution

Directed evolution: iterative engineering of proteins and nucleic acids

Display (zoology)

Dissection

Dissection: anatomical examination by careful cutting

Ditrysia

Ditrysia: the major clade of moths and butterflies

DNA

DNA construct

DNA construct: engineered nucleic acid segments for research and therapy

DNA damage theory of ageing

DNA methylation

DNA methylation: epigenetic control of gene expression

DNA polymerase

DNA polymerase: function, mechanism, diversity, and laboratory uses

DNA repair

DNA repair: mechanisms, significance, and cellular pathways

DNA replication

DNA replication: mechanism, components, and biological importance

DNA virus

Docodonta

Docodonta: Mesozoic mammaliaforms with specialized molars

Domain (biology)

Domain (biology): the highest rank in the classification of life

Domestication

Dopamine reuptake inhibitor

Dopamine reuptake inhibitor (DRI): mechanism, uses, and risks

Dormancy

Dorsal

Dorsal (anatomical term)

Dromaeosaurus

Drosophila

Drosophila (fruit flies): biology, diversity, and scientific importance

Drosophila melanogaster

Drosophila melanogaster — the common fruit fly

A concise encyclopedia entry on Drosophila melanogaster: appearance, life cycle, history as a genetic model, research uses, husbandry, limitations, and distinctions from related sp

Drosophilidae

Drosophilidae: the fruit fly family and its scientific importance

Duct

Duct (anatomy): form, function, and clinical importance

Dunaliella salina

Duodenum

Duodenum — the first segment of the small intestine

Earliest known life forms

Earliest known life forms on Earth

Ebola virus

Ebola virus: overview, symptoms, transmission, history and prevention

Ecdysozoa

Ecological genetics

Ecological genetics: genetics and evolution in natural populations

Ecological niche

Ectopic pregnancy

Ectopic pregnancy: causes, diagnosis, treatment and risks

Ediacaran biota

Ediacaran biota: the earliest large multicellular organisms

Egg

Egg (biology)