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The flashcards below were created by user
VickyMJ
on FreezingBlue Flashcards.
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Bilayer
- Hydrophilic heads: face water
- Hydrophobic tails: stay away from water
together form a phophlipid bilayer
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Selective permiability
- -small nonpolar melecules pass through (permeability)
- -large polar (hydrophilic) molecules cannot.
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Saturated
- -single bonds like C-C are tightly packed
- -carrying max possible hydrogen
- -fatty acid tails
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Unsaturated
- -if its a double bond C=C
- -theres a kink
- -loosely packed
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Diffusion
- -movement along concentration gradient
- -from high concentration to low
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Osmosis
- -diffusion of water across lipid bilayer
- -high concentration to low
- -For osmosis of water to happen, two solutions have to beseparated by a selectively permeable membrane, that allows water to go through, but not thesolutes dissolved in it.
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Hypertonic
water moving outside the cell
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Hypotonic
the cell is submerged in a solution that has less concentration of solutes, water will move into the cell by osmosis
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Isotonic
If solute concentrations of the cell and the outside solution are the same,water will move in and out at the same rate.
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Membrane proteins should have amphipathic nature
Hydrophilic side to face the water outside the membrane, hydrophobic side to face the interior of the membrane.
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integral membrane proteins
Proteins in the membrane may be inserted into the membrane
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peripheral membrane proteins
just attached loosely on the surface
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Facilitated diffusion via channel proteins
- -ion channels are pores
- -move from high to low
- -passive transport (no energy)
- -gated channels (can open or close)
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Facilitated diffusion via carrier proteins
- -passive transport
- -connect to molecule to push through
- -ex. glucose
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Active transport by Pumps
- -active transport
- -energy comes from ATP
- -sometimes pumps only move one type of molecule or ion
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