Mastering Biology CH.7 Membrane Structure and Function
Terms in this set (37)
Boundary that separates living cells form its surroundings. Regulate cells molecular traffic.
Allows some substances to cross it more easily than others.
Contains hydrophobic and hydrophilic regions.
Most abundant lipid in the Plasma membrane
Fluid Mosaic Model
Fluid structure with a mosaic of various proteins embedded on it.
Membranes switch from a fluid to a solid state.
Unsaturated fatty Acids
More fluid membrane.
collage of different proteins embedded in fluid matrix of lipic bilayer.
Can dissolve in lipid bilayer and pass through membrane rapidly.
Do not cross membrane easily.
Pass most easily through the lipid core of plasma membrane.
Molecules that spread out evenly into the available space.
Diffusion of a substance across a membrane with no energy needed. Example Osmosis,diffusion,facilitated diffusion.
Substances diffuse down
Concentration gradient in diffusion.
Diffusion of water
From a region of lower solute concentration to higher solute concentration, until the solute concentration is equal on both sides.
Ability of a surrounding solution to cause a cell to gain or lose water.
Same as that inside cell. No net water movement across Plasma membrane. Animal Cell healthiest,Flaccid.
Greater than inside the cell. Cell loses water,Plasmolyzed(Wilt)
Less than that inside the cell. Gains water,Turgid(firm),Plant cell healthiest.
Control of solute concentrations and water balance. Necessary Adaptation.
Allow hydrophilic substances across membrane.
Have hydrophilic channel that certain molecules or ions use as a tunnel.Provide corridors for specific molecules or ions to cross plasma membrane.
They bind to the molecule and change shape to shuttle the molecules across the membrane.
Transport proteins speed passive movement of molecules across plasma membrane. Passive because solutes move down the concentration gradient and the transport requires no energy.
Channel protein for facilitated diffusion of water.
Open or close in response to a stimulus./Gated channels
Moves substances against their concentration gradient, requires energy usually in the form of ATP. Example Protein pump/Bulk transport.
Active transport system. Major electrogenic pump of animal cells.
Transport protein that generates voltage across a membrane.
Occurs when active transport of a solute indirectly drives transport of other solutes.
Main electrogenic pump of plants,fungi and bacteria. Store energy used for cell work.
Release of cellular products.
Into the cell. 3 Types: Phagoctosis,Pinocytosis,Receptor-Mediated Endocytosis,
Process in which extensions of cytoplasm surround and engulf large particles and take them into the cell
cellular process by which cells take in large dissolved molecules, referred to as cell drinking.
The uptake of specific molecules by a cell's receptors
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