A Level Biology - Biological Membranes

Defintion

Keyword

Theory of cell membrane structure with proteins embedded in a sea of phospholipids

Protein with a chain of carbohydrate molecules attached

Movement of molecules from an area of high concentration to an area of low concentration; it may or may not be across a membrane

Cell surface membrane

Movement of molecules from an area of high concentration to an area of low concentration; across a partially permeable membrane via protein channels or carriers

Bulk movement of molecules, too large to pass through a cell membrane via channel or carrier proteins, into a cell

Defintion

Keyword

The movemne of substances against their concentration gradient across a cell membrane, using ATP and protein carriers

Passage of water molecules down their water potential gradient, across a partially permeable membrane

Measure of the tendency of water molecules to diffuse from one region to another

Lipid/carbohydrate with a chain of carbohydrate molecules attached

Bulk movement of molecules, too large to pass through a cell membrane via channel or carrier proteins, out of a cell