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Diffusion and Osmosis
State Lab Vocabulary Terms
20
Biology
9th Grade
12/12/2010

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Term
Diffusion
Definition
The process of moving materials from an area of high concentration to an area of low concentration without energy.
Term
Osmosis
Definition
Special kind of diffusion.  It is the diffusion of water from a high concentration to an area of low concentration.
Term
Dynamic Equilibrium
Definition
When all the molecules are equally distributed and everything is in balance.
Term
Selectively Permeable Membrane
Definition
A membrane that onlys allows certain materials to pass through based on their size.
Term
Benedicts Solution
Definition
An indicator of glucose.  Will change from blue to red in the presence of glucose after being heated for 2 minutes.
Term
Iodine
Definition
An indicator for starch.  Will change from an amber color to blue-black in the presence of starch.
Term
Salt Solution
Definition
Causes the cell membrane to shrink because of the hypertonic concentration it creates.
Term
Cell Wall
Definition
Organelle that provides support to a plant cell. 
Term
Cell Membrane
Definition
Organelle that is semi-permeable.  It will allow some substances through but not others. 
Term
Cytoplasm
Definition
The liquid part of the cell.  Will shrink if placed in a salty environment and will resume shape if placed back in distilled water.
Term
Glucose
Definition
A simple sugar.  Can easily move through a membrane due to its small size.
Term
Starch
Definition
A complex carbohydrate.  Can not move through the membrane because of its size. 
Term
Active Transport
Definition
Moves materials from an area of low concentration to an area of high concentration with ENERGY (ATP).
Term
Concentration Gradient
Definition
The differences of concentration between two environments.
Term
Endocytosis
Definition
Moving things inside the cell with energy
Term
Exocytosis
Definition
Moving things out of the cell with energy.
Term
Hypertonic
Definition
Solution that has a greater concentration of particles (salt for example).
Term
Hypotonic
Definition
A solution that has a lesser concentration of particles. (Distilled water, for example).
Term
Isotonic
Definition
Solution that has an equal amount of particles. 
Term
Homeostasis
Definition
Maintaining an internal balance.
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