basic unit of structure and function in living things.
structures that make up cells
Organisms whose cells contain a nucleus and menbrane-bound organelles
organisms having cells that lack a nucleus and organelles enclosed by membranes
Fluid that occupies most of the space within a cell
controls and directs mostcellular activity; contain DNA and RNA that control protein production and cell operation
Ability for organisms to maintain a stable internal environment
a structure that encloses the cell, gives it shape, and helps to regulate the movement of materials into and out of the cell
allows some materials to pass through, but not all materials.