Explain the Donnan Membrane Phenomenon. Why is it important for the homeostasis of the cell?
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Explain the Donnan Membrane Phenomenon. Why is it important for the homeostasis of the cell?
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- Why is it advantageous for the cell membrane to be fluid in nature?Assume that a membrane permeable to Na+ but not to Cl- separates two solutions. The concentration of sodium chloride on side 1 is higher than on side 2. Which of the following ionic movements would occur? a. Na+ would move until its concentration gradient is dissipated (until the concentration of Na+ on side 2 is the same as the concentration of Na+ on side 1). b. Cl- would move down its concentration gradient from side 1 to side 2. c. A membrane potential, negative on side 1, would develop. d. A membrane potential, positive on side 1, would develop. e. None of the preceding is correct.Why is the Donnan membrane phenomenon important for the homeostasis of the cell?
- Identify how each of the following would pass through the plasma membrane: gases, large polar molecules, charged molecules (like ions), hydrophobic molecules, and small polar molecules. Be specific.Explain why there is resting membrane? *Concerning permeability what type of membrane is the cell membrane?
- In the absence of the sodium-potassium pump,the extracellular solution becomes hypotonic relative to the insideof the cell. Poisons such as the snake venom ouabain can interferewith the action of the sodium-potassium pump. What are theconsequences for the cell?The cytoplasm of a certain cell is composed of a solution that is 98% water, 2% solutes. Consider the solution shown in the beaker in this picture: FOOE OOS Foor solution. [Select] Cytoplasm is 98% water, 2% solutes. The solution in the beaker would be considered when compared to [Select] The plasma membrane is impermeable to solutes. Beaker solution is 98% water, 2% solutes the cell. We would expect that the cell would [Select] if it was placed in the would account for whatever changes might occur to the volume of the cytoplasm of the cell when it is placed in the solution.What type of ion channel contributes to the restingmembrane potential? Describe the permeabilitycharacteristics of the plasma membrane.
- Would substances be able to pass through the plasma membrane if the phospholipid tails of the plasma membrane were both saturated fatty acids? No, saturated fatty acids would cause the plasma membrane to loss the fluidity it has by having some unsaturated fatty acids present. No, saturated fatty acids would cause the plasma membrane to be more fluid. Yes, saturated fatty acids would cause the plasma membrane to be a solid versus liquid. Answer not listed.What is the difference between a semi-permeable mem- brane and a selectively permeable membrane? What does the semi permeable and selectively permeable let pass through?List the three types of specialized membrane junctions?
