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Ch. 6 - Lipids, Membranes, and the First Cells
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All textbooksFreeman 8th EditionCh. 6 - Lipids, Membranes, and the First CellsProblem 3

Chapter 6, Problem 3

What two conditions must be present for osmosis to occur?Integral membrane proteins are anchored in lipid bilayers.

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Hello everyone. And in today's video we have the following problem. So the cell membrane must be blank for osmosis to take place. Remember that osmosis is the movement of water in response to solute concentrations. So now if we want the cell membrane to perform osmosis, which of the following answer choices must be a characteristic of the cell membrane. Well if we have two cell membrane here and we have these water particles, let's draw that on one side and we have these solo particles on the other side. Water is going to go into these high concentration of solute areas because of osmosis. However for this to happen the membrane must be permeable. Otherwise water will not be able to cross this membrane. However, if the membrane is preferable to everything, these salutes will be going also on this direction because the membrane is permeable to them. So this is why if we want osmosis to happen, the membrane will be semi permeable. So it will be permissible to the water molecules for them to move around via osmosis. But it cannot be premium all to the toluene molecules. Otherwise they'll be moving around as well. And osmosis will not be able to take place as effectively. And so that is going to be the answer to our question which is answer choice. C I really hope this video helped him
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Textbook Question

A cell is placed in a solution that is hypotonic to the cell. Which of the following best describes movement of water in this situation? a. Water will only flow into the cell. b. Water will only flow out of the cell. c. Water will flow into and out of the cell, but the overall net movement will be out of the cell. d. Water will flow into and out of the cell, but the overall net movement will be into the cell.

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If a solution surrounding a cell is hypertonic relative to the inside of the cell, how will water move? a. It will move into the cell via osmosis. b. It will move out of the cell via osmosis. c. It will not move, because equilibrium exists. d. It will evaporate from the cell surface more rapidly.

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Which of the following groups of amino acid residues (see Ch. 3, Figure 3.2) would likely be found in the portion that crosses the lipid bilayer? a. acidic b. basic c. polar uncharged d. nonpolar

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Cooking oil lipids consist of long, unsaturated hydrocarbon chains. Would you expect these molecules to form membranes spontaneously? Why or why not? Describe, on a molecular level, how you would expect these lipids to behave in water.

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