3016853
Membrane Structure
- Phospholipid bilayers
- form in water due to
amphipathic properties of
phospholipid molecules
- hydrophilic - attracted to water
- phosphate group
- phosphate group
- hydrophobic - repelled by water
- two hydrocarbon chains
- two hydrocarbon chains
- amphipathic - substances
part philic part phobic
- phosphate heads
- hydrocarbon tails
- stable structures
- formation
- add water
- philics all attracted
- phobic repelled and
attracted to each other
- forms double layers
- philics all attracted
- add water
- form in water due to
amphipathic properties of
phospholipid molecules
- Membrane proteins
- structure
- integral proteins
- transmembrane
- mostly hydrophobic
- embedded into
hydrocarbon chains
- transmembrane
- peripheral proteins
- mostly hydrophilic
- single hydrocarbon chain anchoring
protein to membrane surface
- attached to integral proteins
- mostly hydrophilic
- integral proteins
- position
- proteins oriented to carry
out function correctly
- varying protein content
of the membranes
- proteins oriented to carry
out function correctly
- function
- form barrier though which ions and
hydrophilic molecules cannot pass
- hormone binding sites
- immobilized enzymes
- cell to cell communication
- channels for passive transport
- pumps for active transport
- form barrier though which ions and
hydrophilic molecules cannot pass
- structure
- Cholesterol in membranes
- component of animal
cell membranes
- type of lipid; not fat or oil
- belongs to group steroids
- mostly hydrohobic
- one end has a
hydroxyl- hydrophilic
- positioned
between
phospholipids
- amount in
membrane varies
- component of animal
cell membranes
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