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Chapter 8 words
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11
Biology
9th Grade
03/04/2013

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Term
phospholipid
Definition
a lipid that contains phosphorus and that is a structural component in cell membranes
Term
lipid bilayer
Definition
the basic structure of a biological membrane, composed of two layers of phospholipids
Term
equilibrium
Definition
in biology, a state that exists when the concentration of a substance is the same throughout a space
Term
concentration gradient
Definition
a difference in the concentration of a substance across a distance
Term
diffusion
Definition
the movement of particles from regions of higher density to regions of lower density
Term
carrier protien
Definition
a protein that transports substances across a cell membrane
Term
osmosis
Definition
the diffusion of water or another solvent from a more dilute solution (of a solute) to a more concentrated solution (of the solute) through a membrane that is permeable to the solvent
Term
sodium-potassium pump
Definition
a carrier protein that uses ATP to actively transport sodium ions out of a cell and potassium ions into the cell
Term
signal
Definition
anything that serves to direct, guide, or warn
Term
receptor protein
Definition
a protein that binds specific signal molecules, which causes the cell to respond
Term
second messenger
Definition
a molecule that is generated when a specific substance attaches to a receptor on the outside of a cell membrane, which produces a change in cellular function
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