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1. Abiogenesis Belief that livings things may develop from lifeless matter
2. Acid A compound that In water produces hydrogen ions, usually tastes sour, a pH less
than 7
3. Acid rain rain containing acids that form in the atmosphere when industrial gas emissions
(especially sulfur dioxide and nitrogen oxides) combine with water
4. Alloy Homogenous mixture composed of two or more metals
5. Amoeba A type of Protozoan that has no permanent shape
6. Amorphous having no definite form or distinct shape
7. Amplitude The maximum value of a wave or vibration
8. Anaerobic respi- Fermentation, or respiration in the absence of oxygen
ration
9. Anemia lack of a normal number of red blood cells
10. Anode Positive electrode of an electrolytic cell; negative terminal of a battery; negative
plate of a vacuum tube; site where oxidation occurs
11. Antibiotic compound that blocks the growth and reproduction of bacteria
12. Antibody A protein, usually in the blood of an organism, that serves to counteract the effects
of disease-producing bacteriabor viruses
13. Antidote a remedy that stops or controls the effects of a poison
14. Anticeptic A substance that prevents the growth or activity of bacteria
15. Antitoxin Substance in the body neutralizes toxins
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16. Appendix Wormlike, narrow part of the alimentary canal, in the lower right-hand part of the
human abdomen
17. Armature A piece of metal or a coil of wire that moves back and forth, or rotates, in a
magnetic field
18. Artery a blood vessel that carries blood away from the heart to the periphery of the body
19. Arthropods A group of organisms that have jointed appendages, an exoskeleton, bilateral
symmetry, and reproduce sexually; insects, arachnids, millipedes and cenitpedes,
and crustaceans
20. Ascorbic acid Vitamin C; found in citrus fruits, tomatoes, and green vegetables
21. Aseptic Free of living bacteria
22. Asexual repro- Producing offspring without inion of individulaln or germ cells
duction
23. Assimilation Process by which digested food is utilized by the body to build up or repair cells
24. Asteroid One of a group of "minor plants" between Mars and Jupiter, of which about 1,500
are known
25. Atmosphere The whole mass of gases surrounding a planet
26. Atom smallest particle of an element, consisting of a nucleus surrounded bynelectrons
27. Atomic fission The breaking down of an atomic nucleus, into two or more parts, with a great
release of energy
28. Atomic fusion The joining of atomic nuclei to form heavier nuclei, such as deuterium (heavy
hydrogen) and tritium (another isotope of hydrogen) to make helium, resulting
in the release of enormous quantities of energy
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29. Auricle An upper chamber of the heart thatnreceives blood from the veins-also called the
atrium
30. Autotroph Organism (a green plant) that nourishes itself by making organic materials out of
inorganic
31. Auxin a plant hormone that promotes root formation and bud growth
32. Bacillus aerobic rod-shaped spore-producing bacterium
33. Bacteria (microbiology) single-celled or noncellular spherical or spiral or rod-shaped
organisms lacking chlorophyll that reproduce by fission
34. Balance in Na- the balence of animals and palntes in their enviroment
ture
35. Barometer an instrument that measures atmospheric pressure
36. Basel Metabo- A term used to discribe the amount of energy the body expends when in a inactive
lism or basic (basal) state.
37. Base any of various water-soluble compounds capable of turning litmus blue and
reacting with an acid to form a salt and water
38. Bedrock solid unweathered rock lying beneath surface deposits of soil
39. Benign Tumor a tumor that is not cancerous
40. Bile a digestive juice secreted by the liver and stored in the gallbladder
41. Binomal Nomen- the naming system for organism in wich each organsim is given a two part name-a
clature genus name of different species in an area
42. Biome a major biotic community characterized by the dominant forms of plant life and
the prevailing climate