Go to Section
A-B-C-D-E-F-G-H-I-J-K-L-M-N-O-P-Q-R-S-T-U-V-W-X-Y-Z
- T cell
- Lymphocyte that matures within the thymus. The cells active in cell-mediated immunity are T cells. [Discussion] [CD4+ subset] [CD8+ subset] [Helper subsets (Th1 and Th2)] [Gamma/Delta T cells]
- T system
- TACO
- tryptophan-aspartate coat protein
- Taenia solium
- Taiga
- Tapeworms
- TAP = Transporter associated with antigen processing
- Taq polymerase
- Taste
- in humans
- TATA box
- Taxis
- Taxol
- Taxonomy
- Classification of organisms. [Discussion]
- TBP
- TATA-binding protein
- TCDD (dioxin)
- TCR
- T-cell receptor for antigen. [More] [gene segments]
- Telomerase
- Telomeres
- Temperate
- [deciduous forest] [rain forest]
- Tendon
- Teratogen
- A substance that causes birth defects.
- Teratoma
- Tertiary structure, of protein
- tesla
- Test cross
- [monohybrid] [dihybrid]
- Testes, human
- Testosterone
- Tetanus
- Sustained maximal contraction of a muscle. [More]
- Tetracycline antibiotics
- Tetracycline response element
- Tetrad
- (1) The duplicated homologous chromosomes held together by chiasmata prior to anaphase of meiosis I. Each tetrad contains four chromatids. [More] (2) The four products of meiosis kept together like the four spores in the ascus of budding yeast.
- Tetrapods
- TFIID
- Transcription factor IID
- Thalamus
- THC
- delta-9-tetrahydrocannabinol
- Thecodonts
- Therapsids
- Thermoacidophiles
- Thiamine
- vitamin B1
- Thick (and thin) filaments of muscle
- Thoracic duct
- Three-point Cross
- Threonine
- Threshold
- Minimum intensity of a stimulus to which something responds. [of neurons] [of skeletal muscle]
- Thrombin
- Thrombocytopenic purpura, immune
- Thrombomodulin
- Thrombopoietin
- Thylakoid
- [structure] [and light reactions]
- Thymidine kinase
- Thymine
- Thyroid-stimulating hormone (TSH)
- Thyrotoxicosis (Graves' disease)
- Thyrotropin-releasing hormone (TRH)
- Thyroxine
- Tight Junctions
- Timeless (tim) gene
- Tinbergen, N.
- Tissue
- Association of cells bound together by cell walls (plants) or extracellular matrix (animals) that performs particular functions. [plant tissues] [animal tissues]
- Tissue Factor (TF)
- Tissue typing
- to determine histocompatibility
- Tissue plasminogen activator (TPA)
- Titin
- [Size]
- Tocopherol (vitamin E)
- Tonus
- Sustained, partial contraction of a muscle. [More]
- Torr
- A unit of pressure equal to that exerted by a column of mercury 1 mm high; hence equal to the unit mm Hg.
- Total fertility rate (TFR)
- The average number of children in a family.
- Touch, sense of
- Toxin
- Metabolic product (usually a protein) of an organism that is poisonous to another organism.
- Toxoid
- Toxin treated to destroy its poisonous quality but leaves it capable of stimulating the production of antibodies that will be able to bind to the unaltered toxin. The DTP vaccine contains both diphtheria and tetanus toxoid.
- Toxoplasma gondii
- Tracheophyte
- A plant with a vascular system of xylem and phloem. Includes all plants except mosses and their relatives.
- Tranquilizers
- Trans fatty acids
- Transcription
- The synthesis of a sequence of ribonucleotides complementary to the sequence of deoxyribonucleotides in a molecule of DNA. [Discussion]
- Transcription factor
- A protein needed to initiate the transcription of a gene. Some transcription factors bind to specific sequences of DNA (promoters and enhancers); others bind to each other; many bind both to DNA as well as to other transcription factors.
- [general discussion] [selector genes]
[glucocorticoid receptor] [jun,fos,myc] [E2F] [TFIIH] [isolating transcription factors by affinity chromatography]
- Transducin
- Transduction
- Transformation
- 1. The modification of the genotype of a cell by introduction of DNA from another source. [Discussion]
2. The conversion of a normal cell into a cancerous one.[Discussion]
- Transgenic
- An animal or plant that has been deliberately transformed with a foreign gene and is able to pass that gene on to future generations in its gametes.[making transgenic mice] [making transgenic plants]
- Transitions
- [mutation]
- Translation
- The synthesis of a polypeptide in accordance with the genetic information encoded in a molecule of messenger RNA (mRNA).[Discussion]
- Translocation
- (1) Transfer of a piece of one chromosome to another, nonhomologous, chromosome. [More]. [Example: Philadelphia chromosome]
- (2) Transport of proteins in (and out) of the endoplasmic reticulum.
- (3) Transport of materials, e.g., water and food, from one part of a plant to another.
- Transmembrane protein
- Protein that passes one or more times through the lipid bilayer of a cell membrane. [color schematic (48K)]
- Transmissible spongiform encephalopathies
- Transplantation
- [ discussion of organ and tissue transplantation ] [ bone marrow transplantation ]
- Transpiration
- Transpiration-Pull
- Transport vesicle
- Membrane-enclosed structure that shuttles soluble as well as integral membrane proteins to various destinations within the cell. [More]
- Transposons
- Transversions
- [mutation]
- Trematoda
- Tricyclic antidepressants
- Triglyceride
- Trihalomethanes (THMs)
- [by-products of water chlorination]
- Trilinolein
- Trinucleotide repeats
- Trisomy 21
- Tristearin
- Trophic level
- Trophoblast
- Tropical rain forest biome
- Tropisms
- Trypanosomiasis (African sleeping sickness)
- [how the parasite evades the immune response]
- Trypsin
- Tryptophan
- [structure] [repressor]
- TSH
- Thyroid-stimulating hormone
- Tubular secretion
- Tubulin
- Tumor necrosis factor (TNF)
- Cytokine that triggers apoptosis. [More] [secretion by Th1 cells]
- Tumor Suppressor Genes
- Discussion
- Tundra biome
- Tunicata
- (a.k.a. Urochordata)
- Turbellaria
- Turgor
- [in guard cells of leaf]
- Turner's syndrome
- Tyrosine