How does lipid structure affect membrane permeability?
How does lipid structure affect membrane permeability?
At higher temperatures, lipid bilayers become more fluid (think about butter melting on a hot day), and more permeable or leaky. In mammals, cholesterol increases membrane packing to reduce membrane fluidity and permeability. The fatty acids tails of phospholipids also affect membrane fluidity.
How does phospholipid structure relate to the selective permeability?
How does phospholipid structure relate to the selective permeability of the plasma membrane? Explanation: The structure of the plasma membrane makes it selectively permeable, enabling it to regulate the transport of substances into and out of the cell.
Why does the arrangement of the phospholipid bilayer make sense?
The phospholipids organize themselves in a bilayer to hide their hydrophobic tail regions and expose the hydrophilic regions to water. This organization is spontaneous, meaning it is a natural process and does not require energy.
What process do cells use to regulate water content?
Section 15.8Osmosis, Water Channels, and the Regulation of Cell Volume. What these processes have in common is osmosis — the movement of water from a region of lower solute concentration to a region of higher solute concentration.
How do Osmoregulators regulate?
Osmoregulators tightly regulate their body osmolarity, which always stays constant, and are more common in the animal kingdom. Osmoregulators actively control salt concentrations despite the salt concentrations in the environment. An example is freshwater fish.
In which type of solution are the cells?
Flash Cards: Isotonic, Hypertonic, and Hypotonic Solutions
| A | B |
|---|---|
| In which type of solution is a cell in homeostasis (balance)? | isotonic |
| An animal cell placed in which type of solution will shrink as water exits through the cell membrane? | hypertonic |
How can solutions be different?
Explanation: Clearly, we can prepare solutions of different solutes, and with DIFFERENT SOLVENTS…we are not forced to use water as a solvent, and many solutes would not be water-soluble. Typically, solution concentration is reported as a molarity… Molarity=Moles of soluteVolume of solution