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cell transport study assignments
Terms in this set (16)
Osmosis is best defined as
the movements of water molecules across a membrane from an area of high water concentration to an area of lower concentration
Which kind of molecules pass through the cell membrane the most easily
small nonpolar molecules
If a molecule is placed in a hypertonic medium it will
If a molecule is placed in a hypotonic medium it will
A 5% urea solution is _________ to a 10% urea solution
If a cell is placed in an isotonic medium, what kind of net movement will there be?
What does facilitated diffusion require?
What direction does facilitated diffusion occur?
either direction depending on the concentration gradient of the molecule
What is facilitated diffusion used to transport?
sugars and amino acids
Does facilitated diffusion require energy expenditure by the cell?
Why is facilitated diffusion similar to enzymes?
Because they both require a specific transporter for a specific molecule
Simple diffusion is defined as
the movement of molecules from areas of higher concentration to areas of lower concentration
When sugar is mixed with water equilibrium is reached when
the dissolved sugar molecules are evenly distributed throughout the solution
The rate of diffusion is affected by
temperature, the size of molecules, and the steepness of the concentration gradient
Do the molecules in a solid lump of sugar move?
Diffusion is the process whereby
materials are exchanged between a cell and its environment
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