All organisms are made of cells; All existing cells are produced by other living cells; The cell is the most basic unit of life.

A jellylike fluid that fills the inside of a cell.

Structures specialized to perform distinct processes within a cell.

A cell without a nucleus or other membrane-bound organelles.

A cell with a nucleus and other membrane-bound organelles

Double-layer of phospholipids that forms a boundary between a cell and the surrounding environment and controls the passage of materials into and out of a cell.

Model that describes the arrangement and movement of the molecules that make up a cell membrane.

selective permeability

Condition or quality of allowing some, but not all, materials to cross a barrier or membrane

Movement of dissolved molecules in a fluid or gas from a region of higher concentration to a region of lower concentration.

concentration gradient

Difference in the concentration of a substance from one location to another

Diffusion of water molecules across a semipermeable membrane from an area of higher water concentration to an area of lower water concentration.

Solution that has an equal concentration of dissolved particles compared with another solution.

Solution that has a higher concentration of dissolved particles compared with another solution.

Solution that has a lower concentration of dissolved particles compared with another solution.

Energy-requiring movement of molecules across a membrane from a region of lower concentration to a region of higher concentration.

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Biology Ch.3

Biology Ch. 3

Term	Definition
cell theory	All organisms are made of cells; All existing cells are produced by other living cells; The cell is the most basic unit of life.
cytoplasm	A jellylike fluid that fills the inside of a cell.
organelle	Structures specialized to perform distinct processes within a cell.
prokaryotic cell	A cell without a nucleus or other membrane-bound organelles.
eukaryotic cell	A cell with a nucleus and other membrane-bound organelles
cell membrane	Double-layer of phospholipids that forms a boundary between a cell and the surrounding environment and controls the passage of materials into and out of a cell.
fluid mosaic model	Model that describes the arrangement and movement of the molecules that make up a cell membrane.
selective permeability	Condition or quality of allowing some, but not all, materials to cross a barrier or membrane
diffusion	Movement of dissolved molecules in a fluid or gas from a region of higher concentration to a region of lower concentration.
concentration gradient	Difference in the concentration of a substance from one location to another
osmosis	Diffusion of water molecules across a semipermeable membrane from an area of higher water concentration to an area of lower water concentration.
isotonic	Solution that has an equal concentration of dissolved particles compared with another solution.
hypertonic	Solution that has a higher concentration of dissolved particles compared with another solution.
hypotonic	Solution that has a lower concentration of dissolved particles compared with another solution.
active transport	Energy-requiring movement of molecules across a membrane from a region of lower concentration to a region of higher concentration.

Created by: Mr.Devine

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