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AP Biology - Membranes & Transport Flashcards

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7978861609aquaporinChannel protein through which water can diffuse across a membrane.0
7978861610bulk transportMovement of substances too large for protein transport into or out of cell. Includes Endocytosis and exocytosis.1
7978861611carrier proteinProtein that combines with and transports a molecule or ion across the plasma membrane. (protein changes shape in process)2
7978861612channel proteinProtein that forms a channel that allows a particular molecule or ion to cross the plasma membrane.3
7978861613cholesterolA steroid found in animal plasma membranes that helps keep them fluid4
7978861614lysisBursting of a cell.5
7978861615Selectively permeableAbility of plasma membranes to regulate the passage of into and out of the cell; allowing some to pass through and preventing the passage of others.6
7978861616diffusionMovement of molecules or ions from a region of higher to lower concentration; it requires no energy and tends to lead to an equal distribution.7
7978861617enzymatic proteinProtein that catalyzes a specific reaction.8
7978861618facilitated diffusionPassive movement of substances through protein carriers.9
7978861619fluid-mosaic modelModel for the cell membrane based on the changing location and pattern of protein molecules in a fluid phospholipid layer.10
7978861620glycoproteinProtein in plasma membranes that bears a carbohydrate chain. usually acts as an ID marker11
7978861621hypertonic solutionHigher solute concentration (less water) than the cytoplasm of a cell; causes a cell to lose water by osmosis.12
7978861622hypotonic solutionLower solute (more water) concentration than the cytoplasm of a cell;13
7978861623isotonic solutionSolution that is equal in solute concentration to that of the cytoplasm of a cell; causes a cell to neither gain nor lose water by osmosis.14
7978861624junction proteinProteins that assist cell-to-cell communication at the plasma membrane.15
7978861625osmosisDiffusion of water through a differentially permeable membrane.16
7978861626plasmolysisContraction of the cell contents in plants due to the loss of water resulting in cell membrane pulling away from cell wall.17
7978861627receptor proteinProtein located in the plasma membrane or within the cell; binds to a substance and sends a message into the cell to respond.18
7978861628soluteSubstance that is dissolved in a solvent, forming a solution.19
7978861629solventLiquid portion of a solution that serves to dissolve the solute.20
7978861630turgor pressurePressure of the cell contents against the cell wall; determined by the water content of the vacuole and provides internal support.21
7978861631flaccidwhen a plant cell is somewhat wilted (opposite of turgid)22
7978861632sodium-potassium pumpType of active transport that moves Na+/K+ across membranes (3Na+ out and 2 K+ in. Requires 1 ATP)23
7978861635Proton pumpProtein that performs Active transport of H+ across membrane24
7978861636Co-transportWhen a molecule can only be carried across the membrane with a second molecule (usually linked to a pump)25
7978861637phospholipidmain component of the cell membrane. Has a hydrophilic & hydrophobic portion.26
7978861639Water PotentialThe measure of the relative tendency of water to move from one area to another. Water travels toward the LOWER one.27
7978861640Solute Potential-iCRT (measured in bars). For pure water it is zero.28
7978861641simple diffusionmoves from high to low; no energy needed29
7978861642Active TransportMovement of substances against the concentration gradient through protein carrier; requires energy30
7978861643PhagocytosisCell engulfing large particle.31
7978861644PinocytosisCell Engulfing small particles/liquid droplet (cell drinking)32

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