Podcast
Questions and Answers
Why does a membrane containing unsaturated phospholipids stay fluid at lower temperatures?
Why does a membrane containing unsaturated phospholipids stay fluid at lower temperatures?
- The double bonds in unsaturated phospholipids increase rigidity.
- Saturated phospholipids have more kinks that allow for easier movement.
- The bent structure of the unsaturated fatty acid tails prevents tight packing. (correct)
- Unsaturated phospholipids have more hydrogen bonds that increase fluidity.
How do fish adapt to cold environments with respect to their membrane fluidity?
How do fish adapt to cold environments with respect to their membrane fluidity?
- By adjusting the proportion of unsaturated fatty acids in their membranes. (correct)
- By changing the composition of cholesterol in their membranes.
- By decreasing the proportion of unsaturated fatty acids in their membranes.
- By increasing the proportion of saturated fatty acids in their membranes.
What role does cholesterol play in maintaining membrane fluidity?
What role does cholesterol play in maintaining membrane fluidity?
- Cholesterol expands the range of temperatures for optimal membrane function. (correct)
- Cholesterol decreases membrane fluidity at all temperatures.
- Cholesterol at low temperatures increases fluidity by tightening phospholipid packing.
- Cholesterol at high temperatures reduces fluidity by encouraging tight phospholipid packing.
What observation led Larry Frye and Michael Edidin to conclude that membrane proteins move sideways within the plasma membrane?
What observation led Larry Frye and Michael Edidin to conclude that membrane proteins move sideways within the plasma membrane?
What effect does a decrease in temperature have on a membrane rich in saturated fatty acids?
What effect does a decrease in temperature have on a membrane rich in saturated fatty acids?
What is the main function of the plasma membrane?
What is the main function of the plasma membrane?
According to the fluid mosaic model, what surrounds the cell?
According to the fluid mosaic model, what surrounds the cell?
Why is the plasma membrane described as a fluid mosaic model?
Why is the plasma membrane described as a fluid mosaic model?
What feature do phospholipids in the plasma membrane have?
What feature do phospholipids in the plasma membrane have?
How does the plasma membrane act as a selective barrier?
How does the plasma membrane act as a selective barrier?
Which of the following statements best describes the role of the plasma membrane?
Which of the following statements best describes the role of the plasma membrane?
What is the main structural component described in the fluid mosaic model of the plasma membrane?
What is the main structural component described in the fluid mosaic model of the plasma membrane?
How do proteins contribute to the fluidity of the plasma membrane according to the fluid mosaic model?
How do proteins contribute to the fluidity of the plasma membrane according to the fluid mosaic model?
What is the significance of the phosphate group in a phospholipid molecule that makes up the plasma membrane?
What is the significance of the phosphate group in a phospholipid molecule that makes up the plasma membrane?
Why is it important for the plasma membrane to be described as a semipermeable membrane?
Why is it important for the plasma membrane to be described as a semipermeable membrane?
What is the significance of the fatty acid tails of phospholipids in determining membrane fluidity?
What is the significance of the fatty acid tails of phospholipids in determining membrane fluidity?
How does the presence of unsaturated fatty acids impact membrane fluidity at lower temperatures?
How does the presence of unsaturated fatty acids impact membrane fluidity at lower temperatures?
What role does cholesterol play in maintaining membrane fluidity?
What role does cholesterol play in maintaining membrane fluidity?
How do organisms like fish adapt to cold environments by changing their membrane composition?
How do organisms like fish adapt to cold environments by changing their membrane composition?
What experimental evidence supports the lateral movement of membrane proteins within the plasma membrane?
What experimental evidence supports the lateral movement of membrane proteins within the plasma membrane?
