Biology
Articles about living organisms, life processes and biological research.
Neurodegeneration
Neuroethology
Neuroethology: the neural basis of natural animal behavior
Neuron
Neuroscience
Neuroscience — the scientific study of the nervous system and brain function
Neurosecretion
Neurotoxin
Neutrophil
Neutrophil: frontline white blood cell in innate immunity
Niacin
Nicotinamide adenine dinucleotide phosphate
NADP and NADPH: cellular reducing coenzymes in biosynthesis and antioxidant defense
Nidovirales
Nidovirales: biology, families, and significance
Nipple
Nipple (mammary nipple)
Nitrogen cycle
Nitrogen cycle: processes, organisms, and environmental significance
Nomascus
Nomascus — the crested gibbons
Nomen dubium
Nomen dubium (doubtful name)
Non-coding DNA
Non-coding DNA: functions, types and scientific significance
Non-coding RNA
Non-coding RNA (ncRNA): types, roles and history
Nose
Nose: structure, function, health, and evolutionary context
Nostril
Notochord
Notochord: embryonic axial structure and evolutionary role
Novolac
Novolac (phenol–formaldehyde resin)
Nuclear DNA
Nuclear DNA: structure, inheritance, and role in eukaryotic cells
Nuclear membrane
Nuclear membrane (nuclear envelope)
Nuclease
Nuclease (enzyme that cleaves nucleic acids)
Nucleic acid
Nucleic acids: structure, function, and biological significance
Nucleobase
Nucleobase — fundamental bases of DNA and RNA
Nucleoid
Nucleoid (prokaryotic genetic region)
Nucleolus
Nucleolus: structure, function and role in ribosome production
Nucleosome
Nucleotide
Nucleus
Nucleus: central structures in cells, atoms, comets, and brains
Nucleus (brain)
Nucleus (brain structure)
Nutrient
Nutrient (biology)
Nutrition
Obazoa
Obazoa: a proposed eukaryote clade linking opisthokonts, apusomonads and breviates
Occipital bone
Occipital lobe
Octocorallia
Oestradiol
Oestradiol (E2): roles, biology, and clinical significance
Oestrogen
Oestrone
Oestrous cycle
Olfactory bulb
Olfactory system
Olfactory system: structure, function, and role in vertebrate behavior
Oligotroph
Oligotroph: organisms adapted to nutrient-poor environments
Omnivore
On the Origin of Species
On the Origin of Species — Charles Darwin's 1859 work
Oncogene
Oncogene: genes that promote uncontrolled cell growth
Online Mendelian Inheritance in Man
Online Mendelian Inheritance in Man (OMIM): a concise reference for human genes and phenotypes