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Chapter 5
the working cell
14
Biology
Undergraduate 2
09/10/2009

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Term
Phospholipid Bilayer
Definition
they are made from unsaturated fatty acids that have kinks in their tails. (Peanut butter)
Term
Diffusion
Definition
is a process in which particles spread out evenly in an available space
Term
Concentration gradient
Definition
particles diffuse down the concentration gradient.
Term
Passive Transport
Definition
Diffusion across a cell membrane that doesnt require energy.
Term
Osmosis
Definition
When water moves across membranes in response to solute concentration inside and outside of the cell.
Term
Tonicity
Definition
A term that describes the ability of a solution to cause a cell to gain or lose water.
Term
Osmoregulation
Definition
Many organisms are able to maintain water within their cells, it prevents ecessive uptake or excessive loss of water.
Term
ATP
Definition
Adenosine Triphospate, energy of currency of cells. The immediate source of energy that powers most forms of cellular work. MONEY FOR CELLS
Term
Active Transport
Definition
Requires energy
Term
Phagocytosis
Definition
is engulfment of particle by wrapping cell membrane around it, forming a vacuole
Term
Pinocytosis
Definition
is the same as phagocytosis except that fluids are taken into small vesicles
Term
Receptor-mediated endocytosis
Definition
is where receptors in a receptor-coated pit interact with a specific protein, initating formation of a vesicle
Term
Kinetic Energy
Definition
energy of motion ex car
Term
Potentail Energy
Definition
is energy that an object possesses as a result of its location ex. water
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