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BIO 120 Chapter 7

Membrane Structure and Function

Tails- made of fatty acids, hydrophobic
Heads- hydrophilic
Membrane contains- proteins and enzymes
Cooler temperature means- membrane is less fluid
Warmer temperature means- membrane is more fluid
Proteins function- transport and receive information and signals
Saturated fatty tails mean- less fluid, thicker
Unsaturated fatty tails mean- more fluid, thinner
Effect of cholesterol- reduces fluidity at moderate temperature, prevents solidification at low temperatures
Diffusion- molecules cross membrane moving from high to low
Passive transport: simple diffusion and facilitated diffusion
Simple diffusion- moves from high to low, no energy needed, no protein helper
Facilitated diffusion- moves from high to low, no energy needed, has a protein helper
Active transport- moves from low to high, ATP required, protein helper, pumps protons into lysosome
Bulk transportation- moves from low to high, needs energy, endocytic or exocytic vesicle helps with entrance or exit from cell
Hypertonic- Concentration of solute is higher outside the cell
Hypotonic- concentration of solute is higher inside the cell
Isotonic- concentration of solute is the same on both sides
Q: what kinds of molecules can pass through membrane? small, non-charges, non-polar molecules
Q: can water pass through membrane? yes, water is small enough to pass through aquapain or membrane with a protein helper, plays a role in osmosis
Osmosis- the passive movement of water from areas with low to high concentrations of solute
Carrier protein- change shape, help facilitate diffusion across membrane
Channel protein- maintains shape, helps facilitate diffusion across membrane
Created by: mr_spangler