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Exam 3 - Ch. 7
Exam 3 - Ch. 7
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Biology with MasteringBiology? (8th Edition)
Surrounds the cell and separates the interior of the cell from the external environment
phospholipids molecules spontaneously form bilayers in aqueous environments due to their ____ nature and overall cylindrical structure
describes the structure and properties of cell membranes
fluid mosaic model
amphipathic proteins that are firmly bound to the membrane, and can only be released from the membrane by detergents
not embedded in the membrane; they are usually bound ionically or by hydrogen bonds to a hydrophilic portion of an integral protein
movement of particles from an area of high concentration to an area of lower concentration
A difference in concentrations establishes a
concentrations on both sides of the membrane are equal
diffusion of a solvent across a membrane
determined by the amount of dissolved substances in a solution; the tendency of water to move into the solution
when two solutions have the same osmotic pressure, they are:
when a solution has a higher osmotic pressure than another
relatively lower osmotic pressure
hydrostatic pressure in cells with a cell wall
special integral membrane proteins assist in transport across membranes
when net transport follows a concentration gradient, but proteins are needed to assist in transport.
often provides a regulated channel or pore through the membrane
requires energy to work against a concentration gradient
can also provide the energy for active transport
fusion of vesicles or vacuoles with the plasma membrane that results in secretion outside the cell or discarding waste outside the cell
vesicles or vacuoles bud into the cell from the plasma membrane, bringing materials into the cell
large solid particles are ingested
smaller regions of dissolved materials are ingested
receptor proteins in the plasma membrane bind to specific molecules, causing protein conformational (shape) changes that lead to the formation of a coated vesicle
The transfer of information across the cell membrane
special protein receptors in the cell membrane bind to signaling molecules outside the cell
The receptor, now activated, changes shape in some way and transfers information to the interior of the cells
form strong bonds, making it hard to separate the cells from one another
relatively wide channels across the cell wall between adjacent cells; they actually connect the plasma membranes of the two cells, and allow exchange of some materials between the cells
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