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AP Biology Campbell 8th Edition - Chapter 7 Flashcards

Chapter 7 - Membrane Structure and Function

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3189040715Selective Permeabilityproperty of the plasma membrane that allows some substances to cross membrane more easily than others0
3189040716Fluid Mosaic Modelmodel of plasma membrane; displays cell membrane as a mosaic of protein molecules drifting in a fluid lipid bilayer1
3189040717Amphipathichaving both a hydrophilic region and hydrophobic region2
3189040718PhospholipidMost abundant lipid in plasma membrane; contains charged, hydrophilic head, and uncharged, hydrophobic tails3
3189040719Cholesterollocated between phospholipid tails, affects fluidity of cell membrane at different temperature4
3189040720Integral Proteinstypes of cellular membrane proteins, penetrates the hydrophobic core of the lipid bilayer, includes all transmembrane protein5
3189040721Peripheral Proteinstypes of cellular membrane proteins, not embedded into lipid bilayer, they are appendages loosely bounded to the surface of membranes6
3189040722Glycolipida lipid with convalently attached carbohydrates, form hydrogen bond with surrounding water molecules, and act as receptor molecule7
3189040723Glycoproteina protein with convalently attached carbohydrates, form hydrogen bond with surrounding water molecule, and act as receptor molecule8
3189040724Transport Proteina protein that allows passage of hydrophilic substances across the membrane9
3189040725Aquaporina transport protein that allows passage of water across the plasma membrane10
3189040726Passive Transportdiffusion of a substance across a membrane with no energy investment11
3189040727Diffusiona type of passive transport, the movement of molecules of any substance so that they spread out evenly into available space12
3189040728Concentration Gradientin absence of other forces, a substance will diffuse from where it is more concentrated to where it is less concentrated13
3189040729Osmosisa type of passive transport, the diffusion of water across a selectively permeable membrane14
3189040730Tonicitythe ability of a solution to cause a cell to gain or lose water, the concentration gradient of dissolved substances15
3189040731Isotonicno net movement of water across the plasma membrane; concentration of solutes is the same as it is inside the cell16
3189040732Hypertoniccell will lose water because concentration of solutes is greater than it is inside the cell17
3189040733Hypotoniccell will gain water because concentration of solutes is less than it is inside the cell18
3189040734Turgor Pressurethe pressure of water inside a plant cell pushing outward against the cell membrane19
3189040735Facilitated Diffusiona type of passive transport aided by proteins20
3189040736Channel Proteina protein that provides corridors that allow hydrophilic substances across the plasma membrane21
3189040737Carrier Proteina protein that changes its shape so it can transport a hydrophilic substance across the plasma membrane22
3189040738Active Transporttransportation of solutes against its concentration gradient; requires energy (ATP)23

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