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Introduction of an inactive or weakened pathogen into the body in order to stimulate an immune reaction that will allow the body to respond quickly to the pathogen if real infection ever occurs. A preparation eliciting an immune response when injected into the body. varix /VAR-icks/ (pl varices /VAR-i-seez/) A varicose vein.
In plant and animal cells, organelles that remove waste and store food. (1) a mucomembranous, thin-walled passage forming the birth canal; the passageway leading out from the uterus to the exterior of the body; the birth canal; (2) any sheathlike part. varicula /vah-RIK-yoo-lə/ (pl variculae /vah-RIK-yoo-lī/) A small varicose vein. Containing or composed of conductive tubes, arteries, or veins — vascularized /VASK-yə-ler-īzd/ adj. The central core of the vascular tissue in a plant root.
Sunburn is a reaction to DNA damage caused by UV light. An inflorescence in which the flower stalks (pedicels) radiate from a common point. The hoselike structure connecting the placenta to the embryo or fetus; contains the umbilical artery and vein. The navel (or umbilicus) marks the point of its former attachment. MOLECULAR STRUCTURE undulipodium (pl undulipodia) /ƏN-dyə-lə-PODE-ee-əm/ n. The muscular reservoir for urine, which it collects from the ureters, and discharges from the body through the urethra. The waste fluid produced by the kidneys and stored in the urinary bladder prior to excretion. Of or pertaining to the reproductive and urinary organs. The study and treatment of disorders of the urogenital organs. The genus to which the brown bear, Ursus arctos, and the cave bear, Ursus spelaeus belong.
UV-B (wavelength 3200 Å-2800 Å) and UV-C (wavelength 2800 Å-1000 Å) radiation both damage DNA and are therefore detrimental to most organisms.
A chordate animal with a backbone; a member of the subphylum Vertebrata (includes mammals, birds, reptiles, amphibians, and fishes). (1) a small cavity with thin walls; (2) a thin, usually fluid-filled, sac; (3) a blister; (4) a hollow, membrane-bound body that encloses and transports macromolecules into and out of eukaryotic cells, and between organelles within such cells. veterinary science /VET-er-in-air-ee, Brit: VET-in-ree/ n.
vessel elements Wide cells that join end-to-end to form water-carrying tubes in angiosperms.
CODONS | MOLECULAR STRUCTURE variance (s where m is the sample mean. (1) of or pertaining to the belly; (2) in humans: toward the front; (3) in animals: toward the underside or belly. (1) in humans: toward, on, or in the anterior and sides; (2) in animals: toward, on, or in the belly and sides. The small vessels that connect veins with capillaries. A blind, fingerlike tube of unknown function attached to the lower end of the human cecum.
vertebrae (also vertebras, sing vertebra) /VERT-ə-bree or -bray, sing: VERT-ə-brə/ n. CRANIAL VIEW OF HUMAN VERTEBRA | LATERAL VIEW OF HUMAN VERTEBRA vertebral canal /VERT-ə-brəl/ n.
Viruses consist of nucleic acid covered by protein; some animal viruses are also surrounded by membrane.
Rays beyond the visible spectrum, emitted by ionized gases and hot bodies such as the sun, with wavelengths between 18 Å.
The flagella of prokaryotes are similar in appearance and function to the undulipodia of eukaryotes, but differ from them with respect to structure. A hoofed mammal unicellular /yoon-ə-SEL-yə-ler/ adj. Single-celled (said of an organism, such as a bacterium).
The vestibule lies between the cochlea and the semicircular canals. A fluid-conducting tube or duct within a living organism. A genus of bacteria including the causative agents of cholera (Vibrio comma) and brucellosis (Vibrio fetus). Short, filamentous processes that occur on certain membranous surfaces such as the interior of the intestines or the surface of the chorion.
In human beings: the middle part of the internal ear.