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Biology Exam 1
Membrane Structure and Support
5
Biology
Undergraduate 4
09/28/2010

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Term
what is the function of the cell membrane?
Definition
1. to maintain homeostasis
2. to provide a boundary (prevents things from entering that cell doesn't want)
3. organizes and localizes function
4. important for controlling transport in and out of cell
5. structures on the membrane are involved in communication and detecting signals
Term
what is the structure of the cell membrane?
Definition
the cell membrane is a made up a lipid bilayer made up mostly of PS (phospholipid and serine) PC ("" choline) and PE (ethanolamine)
Term
what is so special about cholesterol?
Definition
it has a polar OH group which means the tail is stuck in the membrane but the OH off of the head causes the head to stick out. Present in all membranes
Term
what is an example of a disease caused by lipids?
Definition
Tay Sachs
Term
Are membrane lipids distributed symetricall about the membrane?
Definition
NO,
PC are usually OUT and PE are in
once the membrane is assembled it does not flip.
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