biol 107 (2)

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14 Terms

1
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Phospholipid membranes exposed to heat 

become too fluid

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Proteins embedded in membranes exposed to heat

can denature

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Phospholipid membranes exposed to cold

can solidify

4
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If the cell's internal water gets too cold

the water can expand and rupture the cell or an ice crystal can form

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Detergents can cause membranes to 

buckle or break

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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

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what is the structure of a cell membrane?

phospholipid bilayer with embedded proteins and sometimes other molecules

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how does cholesterol affect membrane stability

cholesterol helps increase membrane stability

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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

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