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Chapter Three Vocab
11-15 Quiz
24
Biology
9th Grade
11/12/2010

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Term
active transport
Definition
requires energy from the cells' reserves to make them happen
Term
amphipathic
Definition
any molecule with large polar and non-polar areas
Term
aquaporin
Definition
transport proteins for water
Term
Cholesterol
Definition
keeps membrane fluid despite temperature changes
Term
concentration gradient
Definition
difference between concentrations
Term
crenation
Definition
A process resulting from osmosis in which red blood cells, in a hypertonic solution, undergo shrinkage and acquire a notched or scalloped surface.
Term
Cytoplasm
Definition
Cell substance between cell membrane and nucleus.
Term
Diffusion
Definition
Movement of particles from an area of high concentration to an area of low concentration.
Term
Endocytosis
Definition
Transport of solid matter or liquid into a cell by means of a solid vacuole or vesicle.
Term
Exocytosis
Definition
Expels materials which are in vesicles.
Term
Facilitated diffusion
Definition
Substances cannot dissolve through membrane so they use membrane proteins.
Term
Hypertonic
Definition
A solution that gains water
Term
Hypotonic
Definition
A solution that loses water
Term
Isotonic
Definition
The concentrations of solutes are equal across the cell membrane
Term
Osmosis
Definition
Diffusion of water across a membrane.
Term
Passive transport
Definition
Transport without cell needing to expend energy
Term
Phospholipid bilayer
Definition
Two layered arrangement of phosphate and lipid molecules that form a cell membrane.
Term
Plasma membrane
Definition
Semipermeable membrane enclosing the cytoplasm of a cell
Term
plasmolysis
Definition
opposite turgor so cell dead
Term
receptor protein
Definition
recieves molecular signals
Term
recognition protein
Definition
made up of glycoproteins and have carbohydrates and proteins
Term
selectively permeable
Definition
only allows some things to go in and out
Term
transport proteins
Definition
allows certain substances to go through
Term
turgor
Definition
pressure from inside of cell against cell wall
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