Biology Dictionary: A
Search or browse the dictionary for the definition of biology terms starting with the letter “A”.
Dictionary > A
A
- A Band
- Abdomen
- Abiogenesis
- Abiotic
- Abiotic factor
- Abscission
- Absolute fitness
- Absorption
- Accessory pigment
- Acellular
- Acid
- Acidophile
- Acoelomate
- Action potential
- Active transport
- Adaptation
- Adaptive evolution
- Adaptive radiation
- Adaptive trait
- Adaptive zone
- Adenine
- Adenosine diphosphate
- Adenosine triphosphate
- Adhesion
- Adventitious root
- Aerial root
- Aerobic
- Aerobic bacteria
- Aerotolerant
- Afferent Nerve
- Agar
- Agglutination
- Agonist muscle
- Agriculture
- Akinetes
- Algae
- Algal bloom
- Alkaliphile
- Allele
- Alloimmunity
- Allopatric speciation
- Allopolyploidy
- Amino acid
- Amino acid sequence
- Ammonification
- Amnion
- Amniote
- Amoeboid movement
- Amoebozoa
- Amphimixis
- Amylase
- Amyloplast
- Anabolic pathway
- Anabolism
- Anaerobic
- Anaerobic process
- Anaerobic respiration
- Analogous
- Analogous structures
- Analogy
- Anaphase
- Anaphase I
- Anaphase II
- Anastomosis
- Anatomy
- Anemia
- Angiosperm
- Animal
- Animal Kingdom
- Animal testing
- Antagonism
- Antagonistic Muscle
- Anther
- Antibiotic
- Antibody
- Anticodon
- Antigen
- Apical bud
- Apical Dominance
- Apical meristem
- Apicomplexa
- Apoenzyme
- Apomixis
- Apomorphy
- Apoptosis
- Apparent competition
- Appendage
- Appositional growth
- Archaea
- Archaebacteria
- Archaeplastida
- Arthropod
- Asexual reproduction
- Assay
- Assimilation
- Aster
- Atom
- ATP synthase
- Atria
- Atrium
- Atrophy
- Autecology
- Autocrine signaling
- Autophagy
- Autopolyploidy
- Autosome
- Autotroph
- Aves
- Axon
- Axon hillock
B
- Backbone
- Bacteria
- Bacteriophage
- Balanced diet
- Barophile
- Basal metabolic rate
- Base pair
- Base pair substitution
- Base pairing
- Benign
- Bicoid
- Bidirectional replication
- Bilateral symmetry
- Bile
- Binary fission
- Binomial nomenclature
- BIOACCUMULATION
- Biochemistry
- Biodiversity
- Biogenesis
- Biogeography
- Biological system
- Biology
- Biomass
- Biome
- Biomolecule
- Biosphere
- Biosynthesis
- Biota
- Biotic
- Biotic factor
- Biotic potential
- Bipennate muscle
- Birth Rate
- Bivalent
- Blade
- Blastula
- Blastulation
- Blood
- Blood vessel
- Body cavity
- Bone matrix
- Bone tissue
- Botany
- Branches of biology
- Branching tree
- Buccal cavity
- Budding
- Buffer
C
- C3 plant
- C4 plant
- Caecum
- Calvin cycle
- CAM plant
- Canaliculus
- Cancer
- Capillary action
- Capping
- Capsid
- Capsule
- Carbohydrate
- Carbon
- Carbon dioxide
- Carbon fixation
- Cardiovascular system
- Carnivore
- Carotenoid
- Carrier
- Carrier protein
- Carrying capacity
- Cartilage
- Cartilage cell
- Cartilaginous joint
- Catabolic pathway
- Catabolism
- Cell
- Cell adhesion
- Cell culture
- Cell cycle
- Cell death
- Cell determination
- Cell differentiation
- Cell division
- Cell growth
- Cell junction
- Cell line
- Cell locomotion
- Cell matrix
- Cell membrane
- Cell membrane permeability
- Cell morphology
- Cell plate
- Cell recognition
- Cell sap
- Cell theory
- Cell wall
- Cellular
- Cellular respiration
- Cellulose
- Centromere
- Centrosome
- Chemiosmosis
- Chemiosmotic theory
- Chemoautotroph
- Chemoheterotroph
- Chemolithotroph
- Chemoreceptor
- Chemosynthesis
- Chemotaxis
- Chemotroph
- Chemotropism
- Chiasma
- Chimera
- Chitin
- Chlorophyll
- Chlorophyll a
- Chlorophyta
- Chloroplast
- Cholesterol
- Chondrichthyes
- Chondroblast
- Chordata
- Chromatids
- Chromatin
- Chromoplast
- Chromosomal crossover
- Chromosomal mutation
- Chromosome
- Ciliate
- Cilium
- Circular muscles
- Circulation
- Circulatory system
- Cisterna
- Citric Acid Cycle
- Class
- Cleavage
- Clone
- Cloning
- Closed circulatory system
- Cnidocyte
- CNS
- Coated pits
- Codominance
- Codominant trait
- Codon
- Coelom
- Coenzyme
- Cofactor
- Cohesion Tension Theory
- Colcemid
- Collagen fiber
- Colony
- Commensalism
- Compact bone
- Competition
- Complementary base pairing
- Complementary strands
- Complete dominance
- Compound
- Concentration
- Concentration gradient
- Condyloid joint
- Cone
- Conjugation
- Connective tissue
- Conservation
- Conserved sequence
- Conspecific
- Consumer
- Consumption
- Contamination
- Contractile vacuole
- Control
- Convergence
- Convergent evolution
- Copulation
- Cork
- Cornification
- Cotransport
- Cotyledon
- Covalent bond
- Crenation
- Cristae
- Crop
- Crossbreeding
- Cuticle
- Cyanobacteria
- Cyclic adenosine monophosphate
- Cyclins
- Cytokinesis
- Cytolysis
- Cytoplasm
- Cytoplasmic matrix
- Cytosine
- Cytosol
D
- Dark reaction
- Dark respiration
- Darwinian fitness
- De novo
- Decatenation
- Decomposer
- Decomposition
- Dedifferentiation
- Definitive host
- Degradation
- Deletion mutation
- Deltaproteobacteria
- Denaturation
- Denitrification
- Dense connective tissue
- Dense irregular connective tissue
- Dense regular connective tissue
- Density
- Density dependent limiting factor
- Deoxyribonucleic acid
- Deoxyribose
- Depolarization
- Desiccation
- Detritivore
- Development
- Diarthrodial joint
- Diatom
- Dichotomous
- Dichotomous key
- Dicot
- Differentiation
- Diffusion
- Diffusion equilibrium
- Digestion
- Digestive system
- Dimorphism
- Diploblastic
- Diploid
- Diploidy
- Disaccharide
- Discoidal cleavage
- Disease
- Disjunction
- Dithecous
- Diurnal rhythm
- Divergence
- Divergent evolution
- Diversity
- Division
- Dizygotic twins
- DNA polymerase
- DNA polymerase II
- DNA replication
- Dogma
- Domain
- Dominance
- Dominant
- Dominant species
- Dominant trait
- Dormancy
- Dorsal spine
- Double circulation
- Double stranded DNA virus
- Duplication mutation
E
- Ecological pyramid
- Ecological succession
- Ecosystem
- Ecosystem diversity
- Ectoparasite
- Ectoplasm
- Egestion
- Egg
- Ejaculation
- Elastic cartilage
- Elastic tissue
- Electron acceptor
- Electron carriers
- Electron transport chain
- Element
- Elongation
- Embryo
- Embryology
- Emigration
- Endangered species
- Endemic
- Endocrine system
- Endocytosis
- Endomembrane system
- Endoparasite
- Endoplasmic reticulum
- Endosome
- Endosymbiosis
- Endosymbiotic theory
- Endothelial cells
- Energy
- Energy Flow
- Enteric bacteria
- Enterobacteriaceae
- Entomology
- Environment
- Enzyme
- Enzyme activation
- Epidermis
- Epimastigote
- Epistasis
- Epithelium
- Epoch
- Equilibrium
- Erythrocyte
- Eubacteria
- Euchromatin
- Eucoelomate
- Eukarya
- Eukaryote
- Eukaryotic cells
- Euploidy
- Evolution
- Ex vivo
- Exocytosis
- Exon
- Exotic species
- Exploitation competition
- Expression
- Extinction
- Extracellular
- Extracellular digestion
- Extracellular fluid
- Extracellular matrix
- Extrinsic muscles
- Exudate
F
- F-factor
- Facilitated diffusion
- Facultative anaerobe
- Facultative mutualism
- Facultative parasite
- Family
- Family traits
- Fastidious organism
- Fat
- Fatty acid
- Fecundity
- Feedback mechanism
- Feedback regulation
- Female
- Fermentation
- Fertilization
- Fertilization membrane
- Fetus
- Fiber
- Fibre
- Fibrinous exudate
- Fibrocartilage
- Fibrous tissue
- Fight or flight reaction
- Filament
- Filial generation
- Filtration
- Fimbria
- First filial generation
- Flaccid
- Flagellate
- Flagellum
- Flatworm
- Flavin adenine dinucleotide
- Flower
- Fluid
- Fluid mosaic model
- Fluorescence
- Food
- Food chain
- Food web
- Fossil
- Fossil record
- Fragmentation
- Frameshift mutation
- Fructose
- Fruit
- Fundamental niche
- Fusiform muscle
- Fusion
G
- Gamete
- Gametogenesis
- Ganglia
- Gap 1 phase
- Gap 2 phase
- Gap junction
- Gastric juice
- Gastrulation
- Gene
- Gene flow
- Gene pool
- Gene transfer
- Generation
- Generation time
- Generic name
- Genetic code
- Genetic disorder
- Genetic diversity
- Genetic drift
- Genetic equilibrium
- Genetic locus
- Genetic material
- Genetic recombination
- Genetic screening
- Genetic variation
- Genetics
- Genome
- Genomic dna
- Genomic imprinting
- Genotype
- Genotypic ratio
- Genus
- GERL
- Germination
- Giemsa stain
- Global warming
- Gluconeogenesis
- Glucose
- Glycerol
- Glycogen
- Glycogenesis
- Glycogenolysis
- Glycolipid
- Glycolysis
- Glycoprotein
- Golgi apparatus
- Gram staining
- Granum
- Grass
- Gravitaxis
- Gravitropism
- Gross photosynthesis
- Ground meristem
- Growth
- Growth rate
- Guanine
- Gut
- Gymnosperm
H
- H antigen
- Habitat
- Haemocoel
- Haemolysis
- Halophile
- Haploid
- Hardy-Weinberg equilibrium
- Hatch
- Heart valve
- Heat
- Heat-labile
- Helicase
- Hemidesmosome
- Hemizygosity
- Hemizygote
- Hemizygous
- Hemoglobin
- Hemolysis
- Hepatocyte
- Heptose
- Herbivore
- Heredity
- Hermaphrodite
- Heterochromatin
- Heterogeneity
- Heterospecific
- Heterotroph
- Heterozygote
- Heterozygous
- Hierarchy
- Histone
- HnRNA
- Holoblastic cleavage
- Holocrine gland
- Homeostasis
- Homeostatic equilibrium
- Homo
- Homo sapiens
- Homo sapiens sapiens
- Homogenate
- Homologous chromosome
- Homologous structures
- Homologue
- Homology
- Homoplasy
- Homozygous
- Hormone
- Host
- Host cell
- Housekeeping gene
- Hox gene
- Human
- Humor
- Humoral immunity
- Hyaline cartilage
- Hyaloplasm
- Hybrid
- Hybrid Sterility
- Hybridization
- Hydrogen
- Hydrolysis
- Hydrolytic cleavage
- Hydrolytic enzyme
- Hydrophilic
- Hydrophobic
- Hydrostatic pressure
- Hydrotropism
- Hyperosmotic
- Hyperpolarization
- Hyperthermophile
- Hypertonic
- Hypertonic solution
- Hyphae
- Hypomorphic mutation
- Hyposmotic
- Hypothesis
- Hypotonic solution
I
- Ichthyology
- Immovable joint
- Immune system
- Immunity
- Immunoglobulin
- Imperfect flower
- Imprinting
- In situ
- In vitro
- In vivo
- Inbreeding
- Incipient Species
- Incomplete dominance
- Incomplete penetrance
- Incubation
- Independent Assortment
- Independent variable
- Indeterminate cleavage
- Indirect life cycle
- Induced fit model
- Infection
- Inflammatory response
- Ingestion
- Inheritance
- Inherited traits
- Initiation
- Inner cell mass
- Inoculating loop
- Inoculation
- Inoculum
- Inorganic salt
- Inspiration
- Insulin
- Integral membrane protein
- Integral protein
- Integument
- Interbreed
- Intercalary meristem
- Interference competition
- Interkinesis
- Intermediate host
- INTERMEDIATE PHENOTYPE
- Internal environment
- Interneuron
- Interphase
- Interspecific competition
- Interspecific hybridization
- Interstitial fluid
- Intracellular
- Intracellular digestion
- Intraspecific competition
- Intron
- Invagination
- Inversion
- Invertebrate
- Involuntary muscle
- Involuntary Response
- Involution
- Ion
- Ion Pump
- Irritability
- Isoenzyme
- Isopeptide bond
- Isotonic
- Isotonicity
L
- Lacrimation
- Lactic acid
- Lactose
- Lacuna
- Lagging strand
- Lamellae
- Lanugo
- Latency
- Law of Dominance
- Law of Independent Assortment
- Law of Segregation
- Law of the minimum
- Legumes
- Lenticel
- Leucoplast
- Leukocytosis
- Life
- Life cycle
- Ligand
- Ligase
- Light
- Light reactions
- Lignin
- Liliopsida
- Lineage
- Linkage
- Linkage map
- Linked genes
- Lipid
- Liver
- Living things
- Lock-and-key model
- Locomotion
- Longitudinal section
- Loose connective tissue
- Lumen
- Lung capacity
- Lymph
- Lymph nodes
- Lymphocyte
- Lymphoid cell
- Lysis
- Lysogenic conversion
- Lysogenic cycle
- Lysosome
- Lytic cycle
M
- Macroevolution
- Macromolecule
- Macroorganism
- Magnification
- Male
- Malic acid
- Maltose
- Mammal
- Mantle
- Mass extinction
- Maternal inheritance
- Matrix
- Maturation
- Mature mRNA
- Medicinal plant
- Medusa
- Meiosis
- Meiosis I
- Meiosis II
- Meiotic spindle
- Membrane
- Membrane protein
- Membrane Transport Protein
- Memory cell
- Mendelian Genetics
- Mendelian inheritance
- Menstruation
- Meristem
- Meroblastic cleavage
- Mesophile
- Mesophyll
- Metabolic pathway
- Metabolic rate
- Metabolic Water
- Metabolism
- Metabolite
- Metachromatic granules
- Metamerism
- Metamorphosis
- Metaphase
- Metaphase I
- Metaphase II
- Metaphase plate
- Metastasis
- Microaerophile
- Microbe
- Microbiology
- Microevolution
- Microfibril
- Microfilament
- Microhabitat
- Micrometer
- Micromolecule
- Microorganism
- Microscope
- Microsphere
- Microspore
- Microtubule
- Microtubule organizing center
- Migration
- Milk
- Mimicry
- Missense mutation
- Mitochondrial inheritance
- Mitochondrion
- Mitogen
- Mitosis
- Mitotic phase
- Mitotic spindle
- Mixotroph
- Modification
- Moiety
- Mole
- Molecule
- Monocot
- Monogenic inheritance
- Monogenic trait
- Monohybrid
- Monohybrid cross
- Monophyletic
- Monoploid
- Monosaccharide
- Monozygotic twins
- Morphology
- Mortality
- Mosaic
- Motility
- Mouth
- MRNA
- Mucus
- Multicellularity
- Multipennate muscle
- Multiple alleles
- Multipotent
- Muscle
- Muscle cell
- Muscle contraction
- Muscle fatigue
- Muscle tone
- Muscle tonus
- Muscular system
- Mutagen
- Mutant
- Mutation
- Mutualism
- Mutualistic symbiosis
- Mycelium
- Myelinated neuron
- Myoblast
- Myocardium
N
- NADH
- Natural active immunity
- Natural environment
- Natural passive immunity
- Natural selection
- Naturally acquired passive immunity
- Nature
- Negative feedback
- Nematocyte
- Nephron
- Nerve
- Nerve impulse
- Nervous system
- Nervous tissue
- Net photosynthesis
- Net primary productivity
- Neurilemma
- Neuroglia
- Neutral mutation
- Nicotinamide adenine dinucleotide phosphate
- Nitrates
- Nitrification
- Nitrogen Cycle
- Nitrogen fixation
- Non Random Mating
- Non-Mendelian inheritance
- Nondisjunction
- Nonsense mutation
- Nuclear division
- Nuclear envelope
- Nuclear membrane
- Nuclear pore
- Nuclear pore complex
- Nuclease
- Nucleic acid
- Nucleoid
- Nucleolus
- Nucleotide
- Nucleus
- Null hypothesis
- Nullisomy
- Nutrient
O
- O antigen
- Obligate aerobe
- Obligate anaerobe
- Obligate mutualism
- Obligate parasite
- Offspring
- Oil
- Okazaki fragment
- Oligopeptide
- Oligosaccharide
- Omnivore
- Oncogene
- Oocyte
- Open circulatory system
- Operator
- Operon
- Opportunistic pathogen
- Orbits
- Order
- Organ
- Organelle
- Organic catalyst
- Organic compound
- Organic molecule
- Organism
- Origin
- Osmoregulation
- Osmosis
- Osmotic lysis
- Osmotic Potential
- Osmotic pressure
- Osmotrophy
- Osteoblast
- Osteocyte
- Outbreeding
- Ovum
- Oxidation
- Oxidative phosphorylation
- Oxygen
- Oxyhemoglobin
P
- P680
- Pancreatic juice
- Paracrine
- Paracrine signaling
- Parallel evolution
- Parapatric speciation
- Paraphyletic
- Parasite
- Parasitism
- Paratenic host
- Parent cell
- Parental generation
- Parthenogenesis
- Particulate inheritance
- Passive immunity
- Passive transport
- Pathogen
- Pathogenicity
- Pedigree
- Pentadactyl Limb
- Pentose
- PEP carboxylase
- Peptidoglycan
- Perception
- Perfect flower
- Perinuclear space
- Peripatric speciation
- Peristalsis
- Peritoneum
- Permeability
- PGA
- Phagocyte
- Phagocytosis
- Phagotrophy
- Phelloderm
- Phenotype
- Phenotype frequency
- Phenotypic ratio
- Pheomelanin
- Phloem
- Phosphate
- Phosphate group
- Phospholipid
- Phospholipid bilayer
- Phosphorylation
- Photoautotroph
- Photoheterotroph
- Photorespiration
- Photosynthesis
- Photosystem
- Photosystem I
- Photosystem II
- Phototaxis
- Phototroph
- Phototropism
- Phyletic gradualism
- Phyllode
- Phylogeny
- Phylum
- Physiological processes
- Physiology
- Phytochrome
- Phytoplankton
- Pili
- Pinocytosis
- Pit
- Plankton
- Plant
- Plantae
- Plaque assay
- Plasma
- Plasma B cell
- Plasmid
- Plasmodesmata
- Plasmolysis
- Plastid
- Pleiotropy
- Ploidy
- Plumule
- Pluripotent
- Pneumatophore
- Point mutation
- Polar compound
- Polar molecule
- Polarity
- Polarization
- Pollen Grain
- Poly a tail
- Polycythemia
- Polygene
- Polygenic inheritance
- Polygenic trait
- Polymer
- Polymerization
- Polymorphism
- Polynucleotide
- Polypeptide
- Polyphyletic
- Polyploid
- Polyploidy
- Polyprotein
- Polysaccharide
- Population density
- Positive feedback
- Postsynaptic cell
- Potency
- Precursor
- Predation
- Predator
- Predator-prey relationship
- Presynaptic cell
- Presynaptic terminals
- Prey
- Primary cell wall
- Primary consumer
- Primary meristem
- Primary oocyte
- Primary phloem
- Primary productivity
- Primary succession
- Primary xylem
- Primate
- Primer
- Prion
- Producer
- Progeny
- Prokaryote
- Prokaryotic cell
- Proliferation
- Promastigote
- Prometaphase
- Promoter
- Promoter gene
- Prophase
- Prophase I
- Prophase II
- Proplastid
- Proprioceptor
- Protein
- Protein domain
- Protein pump
- Protein synthesis
- Proteoglycan
- Proteome
- Protist
- Protista
- Proto-oncogene
- Protocell
- Protoderm
- Proton donor
- Proton gradient
- Proton-motive force
- Protoplasm
- Protozoa
- Pseudodominance
- Pseudopodia
- Pseudostratified columnar epithelium
- Pulmonary ventilation
- Pulse
- Punctuated equilibrium
- Punnett Square
- Purebred
- Purine
- Pyramid of Productivity
- Pyrimidine
- Pyruvate
R
- Race
- Radial symmetry
- Reading frame
- Realized niche
- Reannealing
- Receptor
- Recessive
- Recessive trait
- Recombinant DNA
- Recombination
- Reduction Division
- Reflex
- Regeneration
- Regulation
- Relative fitness
- Relay neuron
- Replication
- Repolarization
- Reproduction
- Reproductive isolation
- Reservoir host
- Residual air
- Respiration
- Respiratory system
- Resting potential
- Restriction enzyme
- Reticular connective tissue
- Reticular fiber
- Retrovirus
- Reverse transcription
- Rhizoids
- Rhizome
- Ribonucleic acid
- Ribose
- Ribosome
- Ribozyme
- Rivet Hypothesis
- RNA virus
- Root
- Root cap
- Root Hair
- Rostrum
- Rough endoplasmic reticulum
- Roughage
- Rubisco
- Runner
S
- Saccharide
- Sample
- Saprophyte
- Saprophytic
- Sarcolemma
- Sarcomere
- Sarcoplasmic reticulum
- Scavenger
- Schizogony
- Science
- Scientific method
- Scientific name
- Secondary cell wall
- Secondary meristem
- Secondary oocyte
- Secondary succession
- Secondary xylem
- Secretion
- Seed
- Segmentation
- Segregation
- Selective permeability
- Selectively-permeable membrane
- Self
- Self antigen
- Semipermeable membrane
- Sensory neuron
- Sensu lato
- Septa
- Sex
- Sex chromosome
- Sex hormone
- Sex linkage
- Sex pili
- Sex-linked
- Sex-linked trait
- Sexual reproduction
- Sexual selection
- Sieve plate
- Signal peptide
- Signal sequence
- Silent mutation
- Simple columnar epithelium
- Simple cuboidal epithelium
- Simple diffusion
- Simple epithelium
- Simple fruit
- Sinew
- Single stranded DNA virus
- Single-stranded DNA
- Siphonophore
- Sister chromatids
- Slime layer
- Smooth endoplasmic reticulum
- Smooth muscle
- Solute
- Solution
- Somatic cells
- Somatosensation
- Speciation
- Speciation event
- Species
- Species Richness
- Specific epithet
- Specificity
- Sperm cell
- Spermatogenesis
- Spermatophyta
- Spermiogenesis
- Sphenopalatine ganglioneuralgia
- Spindle
- Spindle apparatus
- Spindle fiber
- Splicing
- Spongy bone
- Spontaneous generation
- Spontaneous Mutation
- Spore
- Sporophyte
- Sporozoa
- Sporozoan
- Standard deviation
- Starch
- Starlings law
- Statolith
- Stem
- Stem cell
- Sterile
- Steroid
- Sterol
- Sticky end
- Stigma
- Stimulus
- Stock
- Stoma
- Storage
- Strain
- Strata
- Stratified columnar epithelium
- Stratified epithelium
- Stratified squamous epithelium
- Stratum germinativum
- Striated muscle
- Stroma
- Style
- Subcellular
- Submetacentric chromosome
- Subspecies
- Substitution mutation
- Substrate
- Substrate-level phosphorylation
- Substratum
- Succession
- Sucrose
- Sugar
- Sugar-phosphate backbone
- Survival of the fittest
- Sustainability
- Symbiont
- Symbiosis
- Symmetry
- Sympathetic nervous system
- Sympatric speciation
- Symport
- Synapomorphy
- Synapse
- Synaptonemal complex
- Syncytium
- Synecology
- Synergy
- Syngamy
- Synthesis
- Synthesis phase
- Systematics
T
- Tactile sense
- Taxis
- Taxon
- Taxonomy
- Telophase
- Telophase I
- Telophase II
- Temperate phage
- Temperate virus
- Terminal electron acceptor
- Terminal web
- Termination
- Terrestrial
- Terrestrial animal
- Terrestrial plant
- Tertiary consumer
- Test cross
- Theory
- Thermophile
- Thermotropism
- Thigmotropism
- Thin filament
- Threatened species
- Thymine
- Tight junction
- Tissue
- Tissue perfusion
- Tonicity
- Tonoplast
- Topology
- Totipotent
- Totipotent cell
- Toxin
- Tracheary elements
- Tracheid
- Tracheophyte
- Traits
- Transcellular fluid
- Transducer
- Transfection
- Transferase
- Transformation
- Transgene
- Transgenic organisms
- Translation
- Translocation
- Transmembrane proteins
- Transmission
- Transmutation
- Transmutation of species
- Transpiration
- Transport
- Transposition
- Transposon
- Triglyceride
- Triploblastic
- Trophic
- Trophic level
- Tropic
- Tropism
- Tropomyosin
- True breeding
- Tubule
- Tumor
- Turgidity
- Turgor pressure
V
- Vaccination
- Vacuolization
- Variation
- Variety
- Vascular bundle
- Vascular plants
- Vascular tissue
- Vector
- Vegetable
- Vegetative Cell
- Vegetative propagation
- Vegetative reproduction
- Ventilation
- Vertical gene transfer
- Vesicle
- Vestigial
- Vicariance
- Vicariant speciation
- Virulent virus
- Virus
- Vitamin
- Vitreous humor
- Voluntary muscle
- Vulnerable species