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Phospholipid membranes exposed to heat
become too fluid
Proteins embedded in membranes exposed to heat
can denature
Phospholipid membranes exposed to cold
can solidify
If the cell's internal water gets too cold
the water can expand and rupture the cell or an ice crystal can form
Detergents can cause membranes to
buckle or break
what are the functions of membranes?
separation of the cell contents from external enviroment, organization of chemicals , reactions into specific organelles, and transport of certain molecules in/ out if the cell
what is the structure of a cell membrane?
phospholipid bilayer with embedded proteins and sometimes other molecules
how does cholesterol affect membrane stability
cholesterol helps increase membrane stability
how can detergents disrupt membranes
detergents are amphipathic molecules; like phospholipids they have both hydrophobic and hydrophobic portions. the difference is their overall shape: phospholipids have a cylindrical shape and detergents can be con shaped. by ‘wedging’ cones into a double plane of cylinders, you can cause the plane to buckle or break