transport across cell membrane Flashcards
what is the function of a cell membrane
controls the entry and exit of materials
what is the cell membrane made up of
proteins
phospholipids
what is the cell membrane described as
selectively permeable
what is diffusion
the movement of molecules from an area of high concentration to an area of low concentration, down a concentration
does diffusion require energy
no, diffusion is a passive process
what is osmosis
movement of water molecules from an area of high water concentration to an area of low water concentration, through a selectively permeable membrane
does osmosis require energy
no, osmosis is a passive process
what piece of equipment is used to show osmosis is occuring
an osmometer
what would happen if an animal cell was left in pure wter
an animal cell would burst
why would an animal cell burst in pure water
because it doesnt have a cell wall
what would happen if an animal cell was left in a strong salt/sugar solution
an animal cell would shrink
what would happen if the water concentration is the same inside and outside of the cell?
there would be no net movement
what would happen if a plant cell was left in pure water
a plant cell would become turgid
why would a plant cell not burst if it was left in pure water
because it has a cell wall
what would happen if a plant cell was left in a strong salt/sugar solution
a plant cell would become plasmolysed
