Biology
Articles about living organisms, life processes and biological research.
Plant cell
Plant cell: structure, functions, and distinguishing features
Plaque
Plaque: flat objects, biological films, and arterial deposits
Plasmid
Plasmid — extrachromosomal DNA elements, biology and applications
Plasmodesma
Plasmodesma: plant cell intercellular channels
Plasmodiidae
Plasmodiidae: family of blood parasites including Plasmodium
Plasmodium
Plasmodium: genus of malaria-causing parasitic protozoa
Platelet
Platyzoa
Pleiotropism
Pleiotropism (pleiotropy): when one gene affects many traits
Ploidy
Ploidy: chromosome set number and its biological significance
Pneumoconiosis
Pneumoconiosis: chronic lung disease from inhaled mineral and dust particles
Point mutation
Pollen
Polydnavirus
Polydnaviruses
Polymerase chain reaction
Polymerase chain reaction (PCR): principles, history, and applications
Polymorphism
Polymorphism (biology): distinct forms within a population
Polypeptide
Polypeptide: Structure, Biosynthesis, and Biological Roles
Polyphyly
Polyphyly: definition, examples, and significance in biological classification
Pons
Pons: structure, function, development and clinical significance
Population genetics
Population genetics: principles, history, and applications
Pore
Pore (opening in biology, materials, and geology)
Pore (skin)
Pore (skin): structure, function, and clinical significance
Positive-sense single-stranded RNA virus
Poxviridae
Poxviridae: family of large double-stranded DNA viruses infecting humans and animals
Precocial
Predation
Predation in ecology: interactions, adaptations, and ecological role
Pregnancy
Premolar
Premolar (tooth): form, function, and variation
Prion
Prion: proteinaceous infectious agents that cause neurodegenerative disease
Proboscis
Proboscis: elongated snouts and tubular feeding organs
Progesterone
Prokaryote
Prokaryote: overview, structure, classification and ecological importance
Promoter (genetics)
Propofol
Propolis
Prosencephalon
Prosencephalon (Forebrain): Structure, Development, and Clinical Significance
Prosimian
Prosimian — informal grouping of early primates
Protacanthopterygii
Protease
Protease — enzymes that cleave proteins and their biological roles
Protein
Protein: structure, synthesis, functions, and significance
Protein biosynthesis
Protein biosynthesis: how cells make proteins
Overview of protein biosynthesis: stages from genetic information to folded protein, core machinery (ribosomes, tRNA, amino acids), differences between prokaryotes and eukaryotes,
Protein Data Bank
Protein Data Bank (PDB): archive of macromolecular structures
Protein filament
Protein filament: structure, types, and biological roles
Protein folding
Protein folding: how polypeptides acquire their functional three‑dimensional form
Protein structure
Protein structure and folding: architecture, dynamics, and methods of study
Proteobacteria
Proteome
Proteome: the complete set of proteins expressed by an organism