water and salt will go in _ directions
diffusion of water
everything goes from a _ concentration to a _ concentration (diffusion)
the difference in concentration between 2 solutions
the tails are _
hydrophobic (don't react well with water)
the heads are _
hydrophilic (react well with water)
the tails are lipid so they are _
the head of a phospholipid bilayer is _
what solution is it where the cell is less concentrated and the cell can swell and pop
what solution is it where the cell is more concentrated and the cell will shrink and die
what solution is it when the cell is equal
what receptor changes cell activity?
what receptor is it when the ligand goes into cell and binds with receptor?
what are the 2 types of receptors?
what r the steps in exocytosis?
1)vesicle takes substance to cell membrane
2)vesicle attaches to cell membrane
3)vesicle opens and releases substance
What are the steps in endocytosis?
1)membrane forms a pouch around the substance
2)vesicle forms around substance
3)vesicle breaks down and releases substance
in _, vesicles move substances out of the cell
_ uses vesicles to move large substances into the cell
what make up vesicular transport?
endocytosis and exocytosis
proteins pump the molecule across the cell membrane _ its concentration gradient
what type of active transports are there?
what kind of transport is it where the molecules are moving up the concentration gradient
what kind of transport requires energy?
what diffusion is it where the protein channel changes to help move the molecules along
movement of water down a water's concentration gradient
what type of passive transport moves molecules straight thro the membrane or through protein channels?
moves molecules from a lower concentration to a higher concentration
move molecules from a higher concentration to a lower concentration
what size of a molecule can pass thro a membrane easier
a smaller molecule
what of a molecule means their ability to pass through a membrane
What 3 things determines how the molecules cross the membrane?
the cell membrane is described as _ _
molecules have to cross the _ _
the cell has to move molecules in and out of the cell to maintain _
what 3 characteristics do all living things have?
1)reproduce and develop
3)respond to their environment
the cell is _