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The study of heredity
One-celled organisms that are useful when they aid in human digestion and harmful when they cause infections
Stage of life during which a human becomes capable of reproduction or the stage of physical development that precedes and initiates adolescence
Surgical experiments or dissection of live animals in scientific research
Thin barrier separating the nucleus from the rest of the cell
Process in metabolism yielding energy by breaking down complex molecules into simpler ones
Long, hairlike, whiplike structure that propels a unicellular organism
Natural process by which the molecules of a substance become mixed with those of another without the action of an external force
Male reproductive cell in a plant or animal
Any poison
Sex chromosome in a fertilized egg that develops into a male if it is present
Study of hereditary improvement through genetic control, particularly in humans
Tough, fibrous protein that makes up human nails and hair and the horn of the rhinoceros
Worldwide project begun in 1990 to determine the precise arrangement of molecules on the human DNA strand
Living thing capable of all basic life functions
Process by which an organism physically and chemically converts food into energy and living tissue
Slipper-shaped protozoan that uses its cilia both to eat and to swim through the water
Building blocks of proteins
Substance whose molecules contain the atoms of two or more elements
Mass of a substance per unit volume
Cell's small organelles where proteins are made, many of which float freely in the cytoplasm
Complex organelles containing chlorophyll within the cytoplasm of plant cells
Theory that living things originate only from other living things of a similar nature
Complex oval and rod-shaped bodies that function as centers of cellular respiration in the cytoplasm; the power plant of the cell
