GED Science Study Guide

Abiogenesis --Belief that livings things may develop from lifeless matter Acid --A compound that In water produces hydrogen ions, usually tastes sour, a pH less than 7 Acid rain --rain containing acids that form in the atmosphere when industrial gas emissions (especially sulfur dioxide and nitrogen oxides) combine with water Alloy --Homogenous mixture composed of two or more metals Amoeba --A type of Protozoan that has no permanent shape Amorphous --having no definite form or distinct shape Amplitude --The maximum value of a wave or vibration Anaerobic respiration --Fermentation, or respiration in the absence of oxygen Anemia --lack of a normal number of red blood cells Anode --Positive electrode of an electrolytic cell; negative terminal of a battery; negative plate of a vacuum tube; site where oxidation occurs Antibiotic --compound that blocks the growth and reproduction of bacteria Antibody --A protein, usually in the blood of an organism, that serves to counteract the effects of disease-producing bacteriabor viruses Antidote --a remedy that stops or controls the effects of a poison Anticeptic --A substance that prevents the growth or activity of bacteria Antitoxin --Substance in the body neutralizes toxins Appendix --Wormlike, narrow part of the alimentary canal, in the lower right-hand part of the human abdomen Armature --A piece of metal or a coil of wire that moves back and forth, or rotates, in a magnetic field Artery --a blood vessel that carries blood away from the heart to the periphery of the body Arthropods --A group of organisms that have jointed appendages, an exoskeleton, bilateral symmetry, and reproduce sexually; insects, arachnids, millipedes and cenitpedes, and crustaceans Ascorbic acid --Vitamin C; found in citrus fruits, tomatoes, and green vegetables Aseptic --Free of living bacteria Asexual reproduction --Producing offspring without inion of individulaln or germ cells Assimilation --Process by which digested food is utilized by the body to build up or repair cells Assimilation --Process by which digested food is utilized by the body to build up or repair cells