parts of a membranephospholipids and proteins
selectively permeableallowing some substances to cross a plasma membrane, usually based on size
passive transportmovement of substances across a plasma membrane without the addition of energy from an area of higher concentration to an area of lower concentration.
concentracion gradientdifferences in concentration on either side of a membrane; for example, more water molecules on the outside of a plasma membrane than inside
diffusionrandom movement of particles across a plasma membrane from an area of high concentration to an area of lower concentration
examples of diffusionperfume, dye in water.
facilitated diffusionmovement of substances through a transport protein, without energy, down the concentration gradient.
what does facilitated diffusion move?ions, large molecules, sugar
osmosisrandom movement of water molecules across a plasma membrane from an area of high concentration to an area of lower concentration.
isotonicsolution that has the same water and solute concentration as inside of cell
active transportmovement of substances across a plasma membrane with the addition of energy, against the concentration gradient (from an area of lower concentration to an area of higher concentration).
endocytosiscell engulfs substances that are too large to go through the plasma membrane
exocitosiscell expels substances that are too large to go through the plasma membrane
if you are gargling salt water to relieve your throat what solution is the salt water compares to the swollen throat cells?hypertonic
a grape in tap water swells, what type of solution is the tap water? why does the grape swell?hypotonic; because wter diffuses into cell
in a solution, a relatively low solute concentracion ourside a cell is calledhypotonic
putting salt on icy roads in winter. Plants along the road become damaged. What solucion is the salty-water running off from the roads? what happens to the plants?hypertonic; they lose water
what is the ideal solution enviorment for a plant to live in? why?hypotonic because they nees the centrele vacuole full and swollen to seep stem/ trunk up
if the concentration of a sugar solucion is higher outside the cell that inside the cell what will happen by osmosis? DRAW PICTURE(pictURE)