Podcast
Questions and Answers
Which lipid type is most likely to be enriched in the outer leaflet of the plasma membrane of animal cells?
Which lipid type is most likely to be enriched in the outer leaflet of the plasma membrane of animal cells?
- Phosphatidylethanolamine
- Phosphatidylserine
- Sphingomyelin (correct)
- Phosphatidylinositol
How would increasing the cholesterol content in a cell membrane affect its permeability to small, water-soluble molecules?
How would increasing the cholesterol content in a cell membrane affect its permeability to small, water-soluble molecules?
- Increase permeability due to disruption of lipid packing.
- Unpredictable; can vary depending on the specific small molecule.
- Have no effect on permeability.
- Decrease permeability by filling spaces between phospholipids. (correct)
How does the length and saturation of fatty acid tails affect membrane fluidity?
How does the length and saturation of fatty acid tails affect membrane fluidity?
- Shorter and more unsaturated tails increase fluidity. (correct)
- Longer and more unsaturated tails increase fluidity.
- Shorter and more saturated tails increase fluidity.
- Longer and more saturated tails increase fluidity.
Lipid rafts are microdomains within the plasma membrane that are enriched in certain lipids. Which of the following lipid compositions is most likely to be found in lipid rafts?
Lipid rafts are microdomains within the plasma membrane that are enriched in certain lipids. Which of the following lipid compositions is most likely to be found in lipid rafts?
What impact does a high concentration of unsaturated fatty acids within membrane phospholipids have on membrane thickness?
What impact does a high concentration of unsaturated fatty acids within membrane phospholipids have on membrane thickness?
How does the presence of specific lipids like phosphatidylserine (PS) on the outer leaflet of a cell membrane affect the cell?
How does the presence of specific lipids like phosphatidylserine (PS) on the outer leaflet of a cell membrane affect the cell?
A researcher is studying the membrane composition of cells adapted to extremely cold environments. What changes in lipid composition would you expect to observe compared to cells in warmer conditions?
A researcher is studying the membrane composition of cells adapted to extremely cold environments. What changes in lipid composition would you expect to observe compared to cells in warmer conditions?
Which of the following is true regarding the transverse movement (flip-flop) of lipids in a cell membrane?
Which of the following is true regarding the transverse movement (flip-flop) of lipids in a cell membrane?
What is the primary role of glycolipids present in the plasma membrane?
What is the primary role of glycolipids present in the plasma membrane?
How would a mutation that disrupts the function of flippases affect the distribution of phospholipids in the plasma membrane?
How would a mutation that disrupts the function of flippases affect the distribution of phospholipids in the plasma membrane?
Flashcards
Lipid Bilayer Composition
Lipid Bilayer Composition
Composed of diverse lipids like phospholipids, cholesterol, and glycolipids, influencing membrane fluidity and function.
Phospholipids in Bilayer
Phospholipids in Bilayer
Phospholipids are amphipathic molecules with a polar head and nonpolar tails; they form the basic structure of the bilayer.
Cholesterol's Role
Cholesterol's Role
Cholesterol modulates membrane fluidity; at high temperatures, it decreases fluidity, and at low temperatures, it prevents freezing.
Glycolipids Function
Glycolipids Function
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