Flashcards in Chapter 7 Vocabulary Deck (35)
Allows some substances to cross it more easily than others
A molecule with both a hydrophobic region and a hydrophillic region.
Fluid Mosaic Model
The membrane is a fluid structure with a "mosaic" of various proteins embedded in or attached to a double layer of phospholipids.
Penetrate the hydrophobic core of the lipid bi-layer, usually trans-membrane proteins
Loosely bound into the membrane, usually connected to the exposed parts of integral proteins.
A cell's ability to distinguish one type of neighboring cell from another. It is crucial to the functioning of an organism. Glycolipids and glycoproteins are involved in this process.
Used to refer to the prescence of carbohydrates
When a carbohydrate is covalently bonded to a lipid or lipids.
When a carbohydrate is covalently bonded to a protein or proteins.
Function by having a hydrophilic channel that certain molecules or atomic ions can use as a tunnel through the membrane
Channel proteins that allow water to pass through
Hold onto their passengers and change shape in a way that shuttles them across the membrane.
The tendency for molecules of any substance to spread out evenly into the available space. The molecules will continue to spread across the membrane until both solutions have equal concentrations. From more concentrated to less concentrated.
A measurement of how the concentration of something changes from one place to another
The diffusion of a substance across a membrane without the use of energy.
Less salinity, causes the cell to swell
More salinity, causes the cell to shrink
The movement of water across a selectively permeable membrane is called osmosis.
The ability of a solution to cause a cell to gain or lose water.
The control of water balance
The cell loses water to its surroundings and shrinks. In a plant, the membrane pulls away from the wall and causes the plant to wilt.
Molecules and ions pass through the lipid bi-layer with the help of transport proteins with the concentration gradient.
A stimulus causes them to open or close, the stimulus can be electrical or chemical.
To transport a molecule against the concentration gradient. This requires energy.
Exchanges sodium(Na+) for Potassium(K+) across the plasma membrane of animal cells.
Electrical potential energy- a separation of opposite charges
The voltage across the membrane.