Membrane Structure Flashcards
_________ is a barrier to prevent the contents of cells from escaping & mixing with molecules in the surrounding environment & it also allows nutrients to come in & waste to leave
The plasma membrane
_________ is responsible for the structure of all cell membranes
Lipid bilayer
__________ form bilayer in water
Membrane lipids
The types of lipids found in cell membranes are _____________
Phospholipids
Phospholipids
Have a phosphate - containing hydrophillic head linked to a pair of hydrophobic hydrocarbon tails
Amphipathic
Molecules with both hydrophillic & hydrophobic parts
Phospolipids are __________
Amphipathic
What are the two conflicts that happens with amphipathic molecules?
- The hydrphillic head is attracted to water
- The hydrophobic tail shun water
A ________ fixes the conflict in amphipathic molecules where in a ________ the hydrophilic head faces water & the hydrophobic tails are shield from water
Bilayer
When a _________ is form the ________ is quickly fixed (They are self - sealing the amphipathic molecules)
Free edge (tear in the bilayer)
The lipid bilayer is a ___________
Flexible 2-D fluid
____________ spontaneously close in on themselves to form sealed compartments called lipidosomes
Phospholipids bilayers
The _______ of a lipid bilayer depends on its composition
Fluidity
The fluidity of a cell membrane
Is the ease that the lipid molecules move within the bilayer
How _______ a lipid is depends on its phospholipid composition mostly on how packed the hydrocarbon tails are
Fluid
The closer & more packed the hydrocarbon tails the __________ the bilayer is
Less fluid