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Cell Membrane Test
Summer School @ Los Gatos High
26
Biology
9th Grade
07/27/2009

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Term
Osmosis
Definition
Water moving across a membrane by passive transport (The diffusion of water (solvent) to decrease concentration of solute)
Term
Solute
Definition
The substance that is dissolved is called the
Term
Diffusion
Definition
The tendency for molecules to spread out evenly. (The movement of solute from high concentration to low)
Term
Concentration gradient
Definition
When materials move from high to low concentration, they are moving down a
Term
Solvent
Definition
The dissolving agent in a solution is called the

(What does the dissolving)
Term
Solution
Definition
A liquid that is a mixture of two or more substances is called a
Term
Volume
Definition
L x L x L
Term
Surface area
Definition
L X L X 6
Term
Homeostasis
Definition
Maintaining the internal balance of the cell. Wastes are brought out and food is brought in
Term
Surface area to Volume
Definition
Large cells have a large _________ to __________ ratio
Term
Surface area to Volume
Definition
Small cells have small _______________ to ________________ ratio
Term
Volume, Surface Area
Definition
As something gets bigger and bigger, the ________ is getting bigger twice as fast as the ____________________
Term
Surface Area, Die
Definition
If a cell doesn't have enough _______________ to support it, the cell will __________
Term
Mitosis
Definition
where the nucleus of the cell divides, resulting in two sets of identical chromosomes. Mitosis accompanied by cytokinesis in which the end result is two completely separate cells called daughter cells.
Term
Cholestrol
Definition
Involved in heart disease
Term
Out
Definition
If there is higher concentration inside that out, the material will go ______
Term
Diffusion
Definition
If the material goes out, it is ___________
Term
Osmosis
Definition
If the material goes in, it is ____________
Term
Active Transport
Definition
When cells must move materials in an opposite direction - against a concentration gradient. It requires Energy
Term
Passive Transport
Definition
The diffusion of substances across a membrane is called __________________
Term
Lipid Bilayer
Definition
A ____________ is a thin membrane made of two layers of lipid molecules. These membranes are flat sheets that form a continuous barrier around cells.
Term
Channel Protein
Definition
Protein forming an aqueous pore spanning the lipid bilayer of the cell membrane which when open allows certain solutes to traverse the membrane.
Term
Integral Protein
Definition
A protein that is firmly anchored in the plasma membrane via interactions between its hydrophobic domains and the membrane phospholipids.
Term
Membrane Protein
Definition
A protein molecule that is attached to, or associated with the membrane of a cell or an organelle.
Term
Peripheral Protein
Definition
These molecules attach to integral membrane proteins, or penetrate the peripheral regions of the lipid bilayer.
Term
Glycoprotein
Definition
Any of a group of conjugated proteins having a carbohydrate as the nonprotein.
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