collection of living matter enclosed by a barrier that separates the cell from its surroundings; basic unit of all forms of life
idea that all living things are composed of cells, cells are the basic units of structure and function in living things, and new cells are produced from existing cells.
the center of the atom which contains the protons and neutrons; in cells, structure that contains the cell's genetic material (DNA) and controls the cell's activities
organism whose cells contain nuclei
unicellular organism lacking a nucleus