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- Oaklands CemeteryOaklands Cemetery is a rural cemetery founded in 1854 in West Goshen Township, Pennsylvani
- ObcellHypothetical earliest form of life
- Objections to evolutionObjections to evolution have been raised since evolutionary ideas came to prominence in th
- Obligate aerobeOrganism that requires oxygen to grow
- Obligate anaerobeMicroorganism killed by normal atmospheric levels of oxygen
- Obligate parasiteType of organism
- Occipital lobePart of the brain at the back of the head
- OCEL1Protein-coding gene in the species Homo sapiens
- OcelloidSubcellular structure found in warnowiids
- Ocular surface microbiomeHuman microbiome of the eye
- OedogoniumOedogonium is a genus of filamentous, free-living green algae. It was first discovered in
- Of Moths and Men2002 book by Judith Hooper
- Off-target genome editingType of unintended effects of genetic modification techniques
- OffspringProduct of reproduction of an organism
- Okazaki fragmentsParts of lagging strand in DNA replication
- Olduvai domainProtein domain implicated in human brain evolution
- Olecranon fossaThe olecranon fossa is a deep triangular depression on the posterior side of the humerus,
- Olga Lepeshinskaya (biologist)Soviet biologist
- Oligogenic inheritanceOligogenic inheritance (Greek ὀλίγος – ὀligos = few, a little) describes a trait that is i
- OligohymenophoreaThe Oligohymenophorea are a large class of ciliates. There is typically a ventral groove c
- OligonucleotideClass of short biopolymers
- Oligonucleotide synthesisChemical synthesis of nucleic acids
- OligopeptideAn oligopeptide (oligo-, "a few"), is a peptide consisting of two to twenty amino acids, i
- OligosaccharideSaccharide polymer
- OligotrophOrganism that can live in an environment that offers very low levels of nutrients
- Omega loopThe omega loop is a non-regular protein structural motif, consisting of a loop of six or m
- Oméga-SixAutomobiles Oméga-Six was a French automobile manufactured in the Paris region by Gabriel
- Omega−3 fatty acidClass of polyunsaturated fatty acids
- Omega−6 fatty acidFatty acids where the sixth bond is double
- OmnivoreAnimal that can eat and survive on both plants and animals
- OmpTOmpT is an aspartyl protease found on the outer membrane of Escherichia coli. OmpT is a su
- Omsk hemorrhagic feverMedical condition
- OncogeneGene that has the potential to cause cancer
- OncogenomicsSub-field of genomics
- Oncolytic adenovirusAdenovirus varieties have been explored extensively as a viral vector for gene therapy and
- OocyteImmature ovum or egg cell
- Oocyte selectionOocyte selection is a procedure that is performed prior to in vitro fertilization, in orde
- OogamyForm of sexual reproduction
- OogenesisEgg cell production process
- OogoniumUndifferentiated female germ cell
- Open Microscopy EnvironmentConsortium for microscopy image data
- Open reading frameDNA section marked with start and stop codon of different length
- OperonGroup of open reading frames under the same regulation
- Ophryocystis elektroscirrhaSpecies of single-celled organism
- Ophrys speculumOphrys speculum, the mirror orchid, is a species of Ophrys distributed throughout the Medi
- OpsinClass of light-sensitive proteins
- Optic nerveCranial nerve connecting the eye to the brain
- Optic stalkThe optic vesicles project toward the sides of the head, and the peripheral part of each e
- Optical mappingDNA visualization technique
- Oral ecologyOral ecology is the microbial ecology of the microorganisms found in mouths. Oral ecology,
- OrbivirusGenus of viruses
- ORC1Origin recognition complex subunit 1 is a protein that in humans is encoded by the ORC1 ge
- Order (taxonomy)Taxonomic rank between class and family
- Organ of CortiReceptor organ for hearing
- Organ systemGroup of organs assembled in a structural unit to serve a common function
- Organellar DNAOrganellar DNA (oDNA) is DNA contained in organelles (such as mitochondria and chloroplast
- Organic matterMatter composed of organic compounds
- Organisation TodtCivil and military engineering group in Nazi Germany
- Organization and expression of immunoglobulin genesThe organization and expression of immunoglobulin genes are fundamental processes that ena
- OrientiaOrientia is a genus of bacteria in family Rickettsiaceae. They are obligate intracellular,
- Orientia tsutsugamushiSpecies of bacterium
- Origin of avian flightEvolution of birds from non-flying ancestors
- Origin of replicationSequence in a genome
- Origin of SARS-CoV-2Inquiries into the origins of SARS-CoV-2
- Origin of speechThe origin of speech differs from the origin of language because language is not necessari
- Origin recognition complexProtein family
- OrnithineChemical compound
- OrnithologyScientific study of birds
- Ornithology (composition)"Ornithology" is a jazz standard by bebop alto saxophonist Charlie Parker and trumpeter Be
- Orphan receptorIn biochemistry, an orphan receptor is a protein that has a similar structure to other ide
- OrthodenticleOrthodenticle (otd) is a homeobox gene found in Drosophila that regulates the development
- OrthoflavivirusGenus of viruses
- OrthogenesisHypothesis that organisms have an innate tendency to evolve towards some goal
- OrthohepadnavirusOrthohepadnavirus is a genus of viruses, in the family Hepadnaviridae. Humans and other ma
- OrthopoxvirusGenus of viruses (poxes)
- OrthoreovirusGenus of viruses
- OsmoregulationActive control of osmotic pressure to maintain homeostasis
- OssewabrandwagPro-Nazi Germany organization in South Africa during WW2
- OssiclesSmall bones in the middle ear
- Otto Friedrich MüllerDanish zoologist
- Our Posthuman FutureOur Posthuman Future: Consequences of the Biotechnology Revolution is a 2002 book by Franc
- Outbreeding depressionReduced biological fitness
- OutcrossingTechnique of crossing between different breeds
- Outer earOuter part of the ear
- Outer membrane vesicleVesicles released from the outer membranes of Gram-negative bacteria
- Outgroup (cladistics)More distantly related group of organisms
- Ovarian follicleStructure containing a single egg cell
- OverdominanceOverdominance is a phenomenon in genetics where the phenotype of the heterozygote lies out
- Overlapping geneAn overlapping gene (or OLG) is a gene whose expressible nucleotide sequence partially ove
- OviductPassageway from the ovaries in vertebrates
- OvulationRelease of egg cells from the ovaries
- Oxidase testThe oxidase test is used to determine whether an organism possesses the cytochrome c oxida
- Oxidative phosphorylationMetabolic pathway
- Ozone depletion and climate changeOzone depletion and climate change are environmental challenges whose connections have bee
