2012考研必备：考研写作1500词(100)
Words Used in VOA Special English Science Programsatom - a very small part of all things; the smallest part of an element that can join with parts of other elements
bacteria - living things that are one cell and can be seen only through a microscope; some cause disease
cell - a small mass of living material that is part of all plants and animals
chromosome - a line of genes; most human cells contain 46 chromosomes
compound - a substance containing two or more elements
dense - close together; thick
electron - a small part of an atom that has an electrical force
element - one of more than 100 substances known to science that cannot be separated into other substances
enzyme - a special kind of protein; it produces changes in other substances without being changed itself
fetus - unborn young
fission - a splitting; in atomic fission, the nucleus of an atom is split to produce nuclear energy
fusion - a joining together; in atomic fusion, atomic particles are joined together to produce nuclear energy
genes - parts of cells that control the growth and development of living things; genes from the mother and father are passed to the child; genes contain nucleic acid
genetic engineering - the science of changing the genes of a living organism
gravity - the force that pulls things toward the center of the earth
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