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- L-arabinose operonGene regulation group
- L-Photo-leucinel-Photo-leucine is a synthetic derivative of the l-leucine amino acid that is used as its
- L-Photo-methionineChemical compound
- LabiaParts of the vulva
- Laboratory experiments of speciationBiological experiments
- LabyrinthulaThe genus Labyrinthula, also known as net slime molds, is part of the protist group Labyri
- Lac operonSet genes encoding proteins and enzymes for lactose metabolism
- Lac repressorDNA-binding protein
- LactaseMilk-sugar digesting enzyme
- LactationRelease of milk from the mammary glands
- LactealLymphatic capillary
- Lactic acid bacteriaOrder of bacteria
- LacticaseibacillusLacticaseibacillus is a genus of lactic acid bacteria.
- Lacticaseibacillus caseiSpecies of bacterium
- Lactiferous ductStructure carrying milk to the nipple
- LactobacillaceaeFamily of bacteria
- Lactobacillus acidophilusSpecies of bacterium
- Lactobacillus bulgaricus GLB44Subspecies of bacterium
- Lactobacillus crispatusLactobacillus crispatus is a common, rod-shaped species of genus Lactobacillus and is a la
- Lactobacillus gasseriSpecies of bacterium
- Lactobacillus inersLactobacillus iners is a species in the genus Lactobacillus. It is a Gram-positive, catala
- Lactobacillus jenseniiSpecies of bacterium
- Lactobacillus kefiranofaciensSpecies of bacterium
- LactocillinLactocillin is a thiopeptide antibiotic which is encoded for and produced by biosynthetic
- LactococcusGenus of bacteria
- LaimosphereMicrobiologically-enriched zone of soil that surrounds plant stems
- LamarckismScientific hypothesis about inheritance
- Lambda phageBacteriophage that infects Escherichia coli
- LaminarinThe molecule laminarin (also known as laminaran) is a storage glucan (a polysaccharide of
- Lancefield groupingLancefield grouping is a system of classification that classifies catalase-negative Gram-p
- Lancelot Alexander BorradaileLancelot Alexander Borradaile (26 September 1872 – 20 October 1945) was an English zoologi
- Land change scienceInterdisciplinary study of changes in climate, land use, and land cover
- Landscape ecologyRelationships between ecological processes in the environment and particular ecosystems
- Large tumor antigenThe large tumor antigen (also called the large T-antigen and abbreviated LTag or LT) is a
- Largest organismsList of largest organisms on Earth
- Largest-scale trends in evolutionLimits of increased complexity over time
- LarynxVoice box, an organ in the neck of amphibians, reptiles, and mammals
- Last eukaryotic common ancestorThe last eukaryotic common ancestor (LECA) is the hypothetical most recent common ancestor
- Last universal common ancestorAncestor of all current life on Earth
- Lateral lineSensory system in fish
- LateralityPreference most humans show for one side of their body over the other
- Laura DemingVenture capitalist
- Laura LandweberAmerican evolutionary biologist
- LaveraniaLaverania is a subgenus of the parasite genus Plasmodium. Infection with these species res
- Law enforcement in South AfricaLaw enforcement in South Africa is primarily the responsibility of the South African Polic
- LeadzymeLeadzyme is a small ribozyme (catalytic RNA), which catalyzes the cleavage of a specific p
- LEAFYPlant gene
- League of German GirlsGirls' wing of the Nazi Party youth movement
- LEAPER gene editingLEAPER (Leveraging endogenous ADAR for programmable editing of RNA) is a genetic engineeri
- Leber's hereditary optic neuropathyMitochondrially inherited degeneration of retinal nerve cells
- LecithinGeneric term for amphiphilic substances of plant and animal origin
- Lecithin–sphingomyelin ratioThe lecithin–sphingomyelin ratio (L/S ratio or L-S ratio) is a test of fetal amniotic flui
- LectinCarbohydrate-binding protein
- Legionella longbeachaeSpecies of bacterium
- LegionellalesOrder of bacteria
- Leibniz Institute of Plant BiochemistryResearch facility in Halle Neustadt, Germany
- LeishmaniaGenus of parasitic flagellate protist
- Leishmania braziliensisLeishmania braziliensis is a Leishmania species found in South America. It is associated w
- Leishmania donovaniSpecies of intracellular parasite
- Leishmania infantumLeishmania infantum is the causative agent of infantile visceral leishmaniasis in the Medi
- Leishmania majorSpecies of parasitic protist
- Leishmania mexicanaSpecies of parasitic protist
- Leishmania tropicaSpecies of protozoan parasite
- Leishmaniasis vaccineVaccine against leishmaniasis
- Lek matingType of animal mating behaviour
- Lek paradoxThe lek paradox is a conundrum in evolutionary biology that addresses the persistence of g
- Lemierre's syndromeLemierre's syndrome is infectious thrombophlebitis of the internal jugular vein. It most o
- Lens (vertebrate anatomy)Eye structure
- Leonid PeshkinRussian scientist
- LeptinHormone that inhibits hunger
- Leptin receptorLeptin receptor, also known as LEP-R or OB-R, is a type I cytokine receptor, a protein tha
- Leptosphaeria maculansSpecies of fungal pathogen
- LeptospiraGenus of bacteria
- Lester W. SharpLester Whyland Sharp (April 21, 1887 in Saratoga Springs, New York – July 17, 1961 in Nuev
- Let-7 microRNA familyRNA family
- Lethal alleleAlleles responsible for death of an organism
- LeucineChemical compound
- Leucine zipperA leucine zipper (or leucine scissors) is a common three-dimensional structural motif in p
- Leucine-rich repeatA leucine-rich repeat (LRR) is a protein structural motif that forms an α/β horseshoe fold
- Leukemia inhibitory factorLeukemia inhibitory factor, or LIF, is an interleukin 6 class cytokine that affects cell g
- Leukotriene B4Leukotriene B4 (LTB4) is a leukotriene involved in inflammation. It has been shown to prom
- Level of support for evolutionVariation in support for the theory of evolution
- LevilactobacillusLevilactobacillus is a genus of lactic acid bacteria.
- Levilactobacillus brevisSpecies of bacterium
- Lewis WolpertBritish biologist (1929–2021)
- LexA repressorThe LexA repressor or LexA (Locus for X-ray sensitivity A) is a transcriptional repressor
- LianaType of woody vine
- Library (biology)Collection of genetic material fragments
- Lichtheimia corymbiferaSpecies of fungus
- Life history theoryAnalytical framework to study life history strategies used by organisms
- Life supportEmergency medical treatment
- Life unworthy of lifePhrase in Nazi Germany
- Ligand (biochemistry)Substance that forms a complex with a biomolecule
- Ligation (molecular biology)Technique for joining nucleic acid fragments
- Limb (anatomy)Moved by muscles paired appendages, which consist of different members
- Limiting factorBottleneck variable limiting the evolution of a system
- Limosilactobacillus fermentumSpecies of bacterium
- Limosilactobacillus pontisSpecies of bacterium
- Lincoln BrowerLincoln Pierson Brower (September 10, 1931 – July 17, 2018) was an American entomologist a
- LINE1LINE1 (an abbreviation of Long interspersed nuclear element-1, also known as L1 and LINE-1
- Linear chromosomeA linear chromosome is a chromosome which is linear in shape, and contains terminal ends.
- Linkage disequilibriumAllele association in population genetics
- Linker histone H1 variantsIn molecular biology, the linker histone H1 is a protein family forming a critical compone
- Linnaean taxonomyRank based classification system for organisms
- LipVisible body parts at the mouth
- LipaseClass of enzymes which cleave fats via hydrolysis
- Lipid bilayerBiological membrane structure
- Lipid IIChemical compound
- Lipid metabolismBiological synthesis and degradation of lipids
- Lipid signalingLipid signaling, broadly defined, refers to any biological cell signaling event involving
- LipidologyScientific study of lipids
- LipidomeThe lipidome refers to the totality of lipids in cells. Lipids are one of the four major m
- LipopolysaccharideClass of molecules found in the outer membrane of Gram-negative bacteria
- LipoproteinBiochemical assembly for transporting hydrophobic lipid molecules
- LipothrixviridaeFamily of viruses
- Lisa NgViral immunologist
- List of animal classesThe following is a list of the classes in each phylum of the kingdom Animalia. There are 1
- ListeriaGenus of bacteria
- LithoautotrophMicrobe which derives energy from minerals
- LithotrophOrganism using inorganic substrate to obtain reducing equivalents for use in biosynthesis
- LitostomateaThe Litostomatea are a class of ciliates. The group consists of three subclasses: Haptoria
- Little Nicky (cat)First commercially produced clone of a cat
- Living fossilOrganism resembling a form long shown in the fossil records
- Living Fossil (short story)"Living Fossil" is a science fiction story by American writer L. Sprague de Camp, on the c
- Living medicineMicrobial therapy (also known as microbial therapeutics) is the use of beneficial microorg
- Locus (genetics)Location of a gene or region on a chromosome
- Locus control regionLong-range cis-regulatory element in DNA
- Locus heterogeneityLocus heterogeneity occurs when mutations at multiple genomic loci are capable of producin
- LokiarchaeumGenus of archaea
- Long interspersed nuclear elementClass of mobile genetic elements
- Long non-coding RNANon-protein coding transcripts longer than 200 nucleotides
- Long terminal repeatA long terminal repeat (LTR) is a pair of identical sequences of DNA, several hundred base
- Lordosis behaviorBody posture in mammals for sexual receptivity
- Lorica (biology)Shell-like protective outer covering of organisms
- Loss of heterozygosityLoss of the copy of a gene from one parent in a diploid organism
- Lotka–Volterra equationsEquations modelling predator–prey cycles
- Low copy numberDNA profiling technique
- Löwenstein–Jensen mediumGrowth medium used to culture Mycobacterium species
- LSmIn molecular biology, LSm proteins are a family of RNA-binding proteins found in virtually
- LSU rRNALarge subunit ribosomal ribonucleic acid (LSU rRNA) is the largest of the two major RNA co
- LuciferaseFamily of proteins which produce bioluminescence
- Ludwig FranzisketGerman World War II fighter pilot and zoologist (1917–1988)
- Lung microbiotaCommunity of microorganisms from the lung
- Lung volumes and capacitiesVolume of air in the lungs
- Luria–Delbrück experiment1943 experiment into rate of mutations
- LuteinYellow organic pigment created by plants
- Lycogala epidendrumSpecies of slime mould
- LymphFluid that circulates throughout the lymphatic system
- Lymph nodeOrgan of the lymphatic system
- Lymphatic vesselTubular vessels that are involved in the transport of lymph and lymphocytes
- LymphokineLymphokines are a subset of cytokines that are produced by a type of immune cell known as
- Lynn JordeAmerican geneticist
- Lysimachia latifoliaLysimachia latifolia, sometimes called Trientalis latifolia, is a species of flowering pla
- LysineAmino acid
- LysisBreaking down of the membrane of a cell
- LysobacterThe genus Lysobacter belongs to the family Xanthomonadaceae within the Gammaproteobacteria
- LysobacteralesOrder of bacteria
- Lysogeny brothCulture medium used in microbiology
- LysozymeAntimicrobial enzyme produced by animals
- LyssavirusGenus of viruses