2012考研必备：考研写作1500词(101)
image - a reproduction of the appearance of a person or thinglaser - an instrument that makes a thin, powerful light
magnet - a piece of iron or other material that has a pulling force; this pulling force is called magnetism
molecule - the smallest amount of a chemical substance that can exist
nerve - a thin piece of tissue that sends information through the body to and from the brain
nucleus - the center part of an atom or cell
nucleic acid - a molecule that holds the genetic information necessary for life; there are two kinds of nucleic acid: DNA (deoxyribonucleic acid) and RNA (ribonucleic acid)
nutrient - a food or substance that makes plants, humans or animals grow
organ - a part of the body that has a special purpose, such as the heart or brain
organism - a living thing, often so small it can be seen only through a microscope
particle - a very small piece of matter
proteins - substances responsible for the growth of tissue and for fixing damaged tissue
robot - a machine that moves and performs tasks
tissue - living material; a group of cells that are similar in appearance and do the same thing
virus - a kind of organism that causes disease
x-rays - a kind of radiation that can pass through most solid materials, often used in medicine
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