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Passive Transport

Lesson B section 1.3

QuestionAnswer
gradual change in chemical concentration from one point to another concentration gradient
movement of molecules from an area where the molecule is in high concentration (more solute than solvent) to an area of lower concentration (less solute than solvent.) diffusion
movement of a molecule from an area of high concentration to an area of lower concentration (diffusion), with the aid of a protein channel or carrier. process is required for larger molecules or charged ions (e.g., amino acids, glucose, Na+, and K+). facilitated diffusion/transport
higher solute concentration (less water)than the cell; causes cell to LOSE water by osmosis. hypertonic solutions
lower solute (more water) concentration than the cytosol of a cell. causes cell to GAIN water by osmosis hypotonic
Solution that is equal in solute concentration to that of the cell; causes cell to NEITHER lose nor gain water by osmosis. isotonic solutions
contraction of the cell contents due to the loss of water. plasmalysis
diffusion of water through a semi-permeable membrane. Water moves from an area of high water concentration (or low solute concentration) to an area of low water molecule (or high solute concentration.) osmosis
the force that moves the water in either direction. osmotic pressure
movement of biochemicals and other molecular substances across membranes, without using chemical energy. depends on a concentration difference (called a 'gradient') and on the permeability of the cell membrane. diffusion, facilitated trans, and osmosis. passive transport
concentration of the cell contents due to loss of water plasmolysis
pressure of the cell contents against the cell wall when the central vacuole is full. turgor pressure
Created by: 612690098
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