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26.19: T

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taproot
single, thick primary root that characterizes the root system of some plants
target cell
type of cell on which a particular hormone has an effect because it has receptor molecules for the hormone
TATA box
regulatory element that is part of the promoter of most eukaryotic genes
taxa
a grouping of organisms in a classification system such as the Linnaean system; for example, species or genus
taxonomy
science of classifying organisms
T cell
type of lymphocyte involved in cell-mediated immunity in which cells infected with viruses are destroyed
telophase
last stage of mitosis during which chromosomes uncoil to form chromatin, the spindle breaks down, and new nuclear membranes form
tendon
tough connective tissue that attaches skeletal muscle to bones of the skeleton
terrestrial biome
a biome of or pertaining to land, as in terrestrial ecosystem
testis (plural, testes)
one of two male reproductive organs that produces sperm and secretes testosterone
testosterone
male sex hormone secreted by the testes
tetrapod
vertebrate with four legs (amphibian, reptile, bird, or mammal)
therapsid
type of extinct organism that lived during the Permian Period and gave rise to mammals
therian mammal
viviparous mammal that may be either a marsupial or placental mammal
thylakoid membrane
membrane in a chloroplast where the light reactions of photosynthesis occur
thyroid gland
large endocrine gland in the neck that secretes hormones that control the rate of cellular metabolism throughout the body
tissue
group of cells of the same kind that perform a particular function in an organism
trachea
long, tubular organ of the respiratory system, also called the wind pipe, that carries air between the larynx and lungs
tracheophyte
type of plant that has vascular tissues, such as a seed plant or flowering plant
transcription
process in which genetic instructions in DNA are copied to form a complementary strand of mRNA
transfer RNA (tRNA)
type of RNA that brings amino acids to ribosomes where they are joined together to form proteins
transgenic crop
crop that has been genetically modified with new genes that code for traits useful to humans
translation
process in which genetic instructions in mRNA are “read” to synthesize a protein
transpiration
process in which plants give off water vapor from photosynthesis through tiny pores, called stomata, in their leaves
transport protein
protein in a plasma membrane that helps other substances cross the membrane
trichomoniasis
common sexually transmitted infection that is caused by protozoa
trilobite
oldest known arthropod, which is now extinct and known only from numerous fossils
trophic level
feeding position in a food chain or food web, such as producer, primary consumer, or secondary consumer
tropism
turning by an organism or part of an organism toward or away from an environmental stimulus
tumor
abnormal mass of cells that may be cancerous
tunicates
members of the subphylum Urochordata are tunicates (also called sea squirts)

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Feb 23, 2012

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Oct 28, 2014
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CK.SCI.ENG.SE.1.Biology.26.20

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