What are the four mechanisms by which cells can remodel membranes to preserve fluidity?
What will be an ideal response?
Answer: The length of fatty acid chains of phospholipids can be shortened, reducing the number of intermolecular bonds and viscosity. Intermolecular bonds between fatty acid chains can also be reduced through bends in the chains by introducing double bonds. Changing the polar heads of phospholipids can reduce the polar interactions between the membrane and its environment: decreasing the phosphatidylcholine to phosphatidylethanolamine ratio reduces the viscosity. And lastly, increasing the concentration of cholesterol increases membrane fluidity at lower temperatures.
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The imaging plane that does not demonstrate the lens of the eye is the ____________________.
Fill in the blank(s) with the appropriate word(s).
The function of the Golgi apparatus is
A. production of microtubules. B. excretion of excess salt. C. packaging and distribution of proteins and lipids. D. DNA replication. E. energy production.
Which of the following subatomic particles can be changed in number without affecting the element identity of the atom?
A. Protons B. Neutrons C. Electrons D. Both "electrons" and "neutrons" are correct.
Which of the following is most commonly fractured in a fall?
A) manubrium B) hyoid C) clavicle D) navicular E) glenoid cavity