Chapter5

phospholipid bilayer also contians -other lipids -proteins -carbohydrates

• self assembling in water • individual molecules are not static (fluid mosaic) • semi permable

hydrophillic molecules small molescules

large molecules ions

their hydrophobic and hydrophillic nature attachment to cytoskeleton

• enzymes • carry signals • transport • cell recongnition • attach membrane to cytoskeleton

diffusion- across a membrane-only occurs from an area of high concentration to an area of low concentration does not require energy from the cell

• temp • concentration gradient • the ability to pass through the membrane

pass through proteins (facilitated diffusion)

diffusion of water water moves from an area of a low to high solute( dissolved substance) concentration

same salt concentration

solution with a lower salt concentration

solution with a higher salt concentration

cause cells to lose or gain water

water pressure and movement

requires potential energy stored by the cell

the ability to do work

it can be changed from one form to another

• heat - living things cant make or convert this to other forms of energy • kinetic energy • potential energy: bonds in molecules, concentration gradients • light

• change the shape of proteins • move molecules • create new bonds

acts as a short term energy storage and transport unit

• transport against a concentration gradient • transport of impermeable substances both are accomplished by membrane bound proteins

transport by movement of the membrane used for bringing large molecules into and out of the cell

golgi bodies