Bio lab 5

cell theory

all living things are composed of cells and cells come from only other cells

tonicity

concentration inside of the cell versus outside of the cell

solute concentration of a solution and its inherent ability to influence the rate and direction of osmosis

high solute concentration = low water concentration

low solute concentration = highwater concentration

diffusion

the movement of molecules from high concentration to low concentration

osmosis

specific type of diffusion

diffusion of water molecules across semipermeable membrane (high to low concentration)

plasma membrane

most cross using phospholipids or protein channels

energy for movement

1. sun —> fuel —> ATP

2. random molecular movement in liquids (concentration gradient)

hypertonic

more salt than cell

water leaves cell

isotonic

same amount of salt as cell

water stay even throughout

hypotonic

less salt than cell

water enters the cell