â¢Plasma membrane (asymmetric) is derived from ER membrane (symmetric). How is a symmetric membrane converted into an asymmetric one?
â¢How might the asymmetric distribution of lipids in the plasma membrane contribute to its function?
â¢Plasma membrane (asymmetric) is derived from ER membrane (symmetric). How is a symmetric membrane converted into an asymmetric one?
â¢How might the asymmetric distribution of lipids in the plasma membrane contribute to its function?
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You are doing research in a lab that studies the effect of changing membrane composition on cellular signal transduction. In particular, you are studying the distribution of an important integral membrane protein in the plasma membrane. This protein functions as a receptor for a neurotransmitter. You discover that this receptor is clustered in âpatchesâ in the membrane. This can be explained by (choose all that apply):
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1.) Which of the following statement best describes how bacteriain a hot spring control the fluidity of their plasma membrane?
They decrease the percentage of lipids with unsaturatedhydrocarbon chains in their plasma membrane |
Because they don't synthesize cholesterol, they cannot controlmembrane fluidity and therefore have a very fluid plasmamembrane. |
They use cholesterol to prevent membranes from becoming toofluid. |
| They form lipid rafts to prevent too much fluidity |
They increase the percentage of lipids with unsaturatedhydrocarbon chains in their plasma membrane. |
2.) Which activity can only be done by a transmembraneprotein?
| To be phosphorylated |
| To signal from one side of the membrane to the other |
| To be glycosylated |
| To associate with other proteins |
| To bind transiently to a lipid bilayer |
