Definition for User contributions

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• 22:28, 26 January 2011 (diff | hist) . . (+118)‎ . . N Thymine dimer ‎ (Created page with "One type of pyrimidine dimer; a site at which two adjacent thymine bases become covalently cross-linked to each other.") (current)
• 22:28, 26 January 2011 (diff | hist) . . (+52)‎ . . N Thyroglobulin ‎ (Created page with "A protein found in the colloid of the thyroid gland.") (current)
• 22:27, 26 January 2011 (diff | hist) . . (+73)‎ . . N Thyroxine ‎ (Created page with "A thyroid hormone that contains iodine and helps regulate metabolic rate.") (current)
• 22:27, 26 January 2011 (diff | hist) . . (+126)‎ . . N Ti plasmid ‎ (Created page with "Tumour-inducing plasmid found in Agrobacterium tumefaciens; it is used as a cloning vector to transfer genes into plant cells.") (current)
• 22:27, 26 January 2011 (diff | hist) . . (+317)‎ . . N Tidal ventilation ‎ (Created page with "A type of breathing in which the lungs are inflated with air and then the chest muscles and diaphragm relax and recoil back to their original positions as an animal exhales. Duri...")
• 22:27, 26 January 2011 (diff | hist) . . (+63)‎ . . N Tidal volume ‎ (Created page with "The volume of air that is normally breathed in and out at rest.")
• 22:27, 26 January 2011 (diff | hist) . . (+170)‎ . . N Tight junction ‎ (Created page with "A type of junction that forms a tight seal between adjacent epithelial cells and thereby prevents molecules from leaking between cells; also called an occluding junction.") (current)
• 22:26, 26 January 2011 (diff | hist) . . (+70)‎ . . N Tissue ‎ (Created page with "The association of many cells of the same type, such as muscle tissue.")
• 22:26, 26 January 2011 (diff | hist) . . (+216)‎ . . N Tolerance ‎ (Created page with "A mechanism for succession in which any species can start the succession, but the eventual climax community is reached in a somewhat orderly fashion; early species neither facili...")
• 22:26, 26 January 2011 (diff | hist) . . (+149)‎ . . N Torpor ‎ (Created page with "The strategy in the smallest endotherms of lowering internal body temperature to just a few degrees above that of the environment to conserve energy.")
• 22:26, 26 January 2011 (diff | hist) . . (+84)‎ . . N Torus ‎ (Created page with "The nonporous, flexible central region of a conifer pit that functions like a valve.") (current)
• 22:25, 26 January 2011 (diff | hist) . . (+67)‎ . . N Total fertility rate ‎ (Created page with "The average number of live births a female has during her lifetime.") (current)
• 22:25, 26 January 2011 (diff | hist) . . (+52)‎ . . N Total peripheral resistance ‎ (Created page with "The sum of all the resistance in all the arterioles.") (current)
• 22:25, 26 January 2011 (diff | hist) . . (+160)‎ . . N Totipotent ‎ (Created page with "The ability of a fertilized egg to produce all the cell types in the adult organism; also the ability of unspecialized plant cells to regenerate an adult plant.") (current)
• 22:25, 26 January 2011 (diff | hist) . . (+165)‎ . . N Trachea ‎ (Created page with "1. A sturdy tube arising from the spiracles of an insect's body involved in respiration. 2. The name of the tube leading to the lungs of air-breathing vertebrates.")
• 22:24, 26 January 2011 (diff | hist) . . (+118)‎ . . N Tracheal system ‎ (Created page with "In insects, a series of finely branched air tubes called tracheae that lead into the body from pores called spiracles.") (current)
• 22:24, 26 January 2011 (diff | hist) . . (+45)‎ . . N Tracheary elements ‎ (Created page with "The tracheids and vessel elements in a plant.") (current)
• 22:24, 26 January 2011 (diff | hist) . . (+118)‎ . . N Tracheid ‎ (Created page with "A type of dead, lignified plant cell that conducts water, along with dissolved minerals and certain organic compounds.") (current)
• 22:24, 26 January 2011 (diff | hist) . . (+44)‎ . . N Tracheophytes ‎ (Created page with "A term used to describe the vascular plants.") (current)
• 22:23, 26 January 2011 (diff | hist) . . (+38)‎ . . N Tract ‎ (Created page with "A parallel bundle of myelinated axons.") (current)
• 22:23, 26 January 2011 (diff | hist) . . (+102)‎ . . N Traffic signal ‎ (Created page with "A short amino acid sequence in a protein's structure that directs the protein to its correct location.") (current)
• 22:23, 26 January 2011 (diff | hist) . . (+84)‎ . . N Trait ‎ (Created page with "A visible characteristic, such as the appearance of seeds, pods, flowers, and stems.") (current)
• 22:22, 26 January 2011 (diff | hist) . . (+76)‎ . . N Transcription factor ‎ (Created page with "A protein that influences the ability of RNA polymerase to transcribe genes.")
• 22:22, 26 January 2011 (diff | hist) . . (+134)‎ . . N Transcription ‎ (Created page with "The use of a gene sequence to make a copy of RNA: transcription occurs in three stages called initiation, elongation, and termination.")
• 22:22, 26 January 2011 (diff | hist) . . (+50)‎ . . N Transcriptional start site ‎ (Created page with "The site in a promoter where transcription begins.") (current)
• 22:21, 26 January 2011 (diff | hist) . . (+150)‎ . . N Transduction ‎ (Created page with "A type of genetic transfer between bacteria in which a virus infects a bacterial cell and then transfers some of that cell's DNA to another bacterium.") (current)
• 22:21, 26 January 2011 (diff | hist) . . (+205)‎ . . N Trans-effect ‎ (Created page with "In both prokaryotes and eukaryotes, a form of genetic regulation that can occur even though two DNA segments are not physically adjacent. The action of the lac repressor on the l...") (current)
• 22:21, 26 January 2011 (diff | hist) . . (+56)‎ . . N Transepithelial transport ‎ (Created page with "The transport of substances from the lumen to the blood.") (current)
• 22:21, 26 January 2011 (diff | hist) . . (+89)‎ . . N Transfection ‎ (Created page with "Gene cloning in which a viral vector is the recombinant vector carrying the desired gene.") (current)
• 22:21, 26 January 2011 (diff | hist) . . (+88)‎ . . N Transfer RNA ‎ (Created page with "tRNA is an RNA that carries amino acids and is used to translate mRNA into polypeptides.")
• 22:20, 26 January 2011 (diff | hist) . . (+170)‎ . . N Transformation ‎ (Created page with "A type of genetic transfer between bacteria in which a segment of DNA from the environment is taken up by a competent cell and incorporated into the bacterial chromosome.")
• 22:20, 26 January 2011 (diff | hist) . . (+130)‎ . . N Transgenic ‎ (Created page with "The term used to describe an organism that carries genes that were introduced by using molecular techniques, such as gene cloning.") (current)
• 22:20, 26 January 2011 (diff | hist) . . (+173)‎ . . N Transition state ‎ (Created page with "In a chemical reaction, a state in which the original bonds have stretched to their limit; once this state is reached, the reaction can proceed to the formation of products.") (current)
• 22:19, 26 January 2011 (diff | hist) . . (+78)‎ . . N Transitional form ‎ (Created page with "An organism that provides a link between earlier and later forms in evolution.") (current)
• 22:19, 26 January 2011 (diff | hist) . . (+244)‎ . . N Translation ‎ (Created page with "The process of synthesizing a specific polypeptide on a ribosome; a nucleotide sequence in mRNA is used to make an amino acid sequence of a polypeptide. The process of translatio...")
• 22:19, 26 January 2011 (diff | hist) . . (+101)‎ . . N Translocation ‎ (Created page with "A phenomenon that occurs when one segment of a chromosome becomes attached to a different chromosome.") (current)
• 22:19, 26 January 2011 (diff | hist) . . (+104)‎ . . N Transmembrane gradient ‎ (Created page with "The phenomenon that the concentration of a solute is higher on one side of a membrane than on the other.") (current)
• 22:19, 26 January 2011 (diff | hist) . . (+129)‎ . . N Transmembrane protein ‎ (Created page with "A protein that has one or more regions that are physically embedded in the hydrophobic region of the cell's phospholipid bilayer.") (current)
• 22:18, 26 January 2011 (diff | hist) . . (+130)‎ . . N Transmembrane transport ‎ (Created page with "The export of a material from one cell into the intercellular space, followed by import of the same substance by an adjacent cell.") (current)
• 22:18, 26 January 2011 (diff | hist) . . (+70)‎ . . N Transpiration ‎ (Created page with "The evaporative loss of water from plant surfaces into sun-heated air.") (current)
• 22:18, 26 January 2011 (diff | hist) . . (+131)‎ . . N Transporter ‎ (Created page with "A membrane protein that binds a solute and undergoes a conformational change to allow the movement of the solute across a membrane.") (current)
• 22:18, 26 January 2011 (diff | hist) . . (+56)‎ . . N Transposable element ‎ (Created page with "A segment of DNA that can move from one site to another.") (current)
• 22:17, 26 January 2011 (diff | hist) . . (+41)‎ . . N Transposase ‎ (Created page with "An enzyme that facilitates transposition.")
• 22:17, 26 January 2011 (diff | hist) . . (+115)‎ . . N Transposition ‎ (Created page with "The process in which a short segment of DNA moves within a cell from its original site to a new site in the genome.") (current)
• 22:17, 26 January 2011 (diff | hist) . . (+101)‎ . . N Transposon ‎ (Created page with "A transposable element that moves via DNA that is removed from one site and inserted into a new site.")
• 22:17, 26 January 2011 (diff | hist) . . (+198)‎ . . N Transverse tubules ‎ (Created page with "Transverse tubules (T-tubules) are invaginations of the plasma membrane that open to the extracellular fluid and conduct action potentials from the outer surface of a muscle fibr...") (current)
• 22:16, 26 January 2011 (diff | hist) . . (+167)‎ . . N Trichome ‎ (Created page with "A projection from the epidermal tissue of a plant that offers protection from excessive light, ultraviolet radiation, extreme air temperature, or attack by herbivores.") (current)
• 22:16, 26 January 2011 (diff | hist) . . (+56)‎ . . N Trichromatic colour vision ‎ (Created page with "The ability to distinguish blue, green, and red colours.") (current)
• 22:16, 26 January 2011 (diff | hist) . . (+73)‎ . . N Triiodothyronine ‎ (Created page with "A thyroid hormone that contains iodine and helps regulate metabolic rate.") (current)
• 22:14, 26 January 2011 (diff | hist) . . (+49)‎ . . N Triplet ‎ (Created page with "A group of three bases that functions as a codon.") (current)

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