Bio 1 Chapter 7

24 July 2022
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question
What name is given to the process by which water crosses a selectively permeable membrane? phagocytosis osmosis pinocytosis passive transport diffusion
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osmosis
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A semipermeable membrane is placed between the following solutions. Which solution will decrease in volume? Solution A: 1.4% (m/v) starch Solution B: 7.62% (m/v) starch
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Solution A
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A semipermeable membrane is placed between the following solutions. Which solution will increase in volume? Solution C: 9% (m/v) NaCl Solution D: 12.4% (m/v) NaCl
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Solution D
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To prevent crenation or hemolysis, a cell must be placed in an isotonic solution such as 0.9% (m/v) NaCl or 5.0% (m/v) glucose. This does not mean that a cell has a 5.0% (m/v) glucose concentration; it just means that 5.0% (m/v) glucose will exert the same osmotic pressure as the solution inside the cell, which contains several different solutes. A red blood cell is placed into each of the following solutions. Indicate whether crenation, hemolysis, or neither will occur. Solution A: 3.21% (m/v) NaCl Solution B: 1.65% (m/v) glucose Solution C: distilled H2O Solution D: 6.97% (m/v) glucose Solution E: 5.0% (m/v) glucose and 0.9%(m/v) NaCl Which Solution results to HEMOLYSIS?
answer
Solution B, C
question
To prevent crenation or hemolysis, a cell must be placed in an isotonic solution such as 0.9% (m/v) NaCl or 5.0% (m/v) glucose. This does not mean that a cell has a 5.0% (m/v) glucose concentration; it just means that 5.0% (m/v) glucose will exert the same osmotic pressure as the solution inside the cell, which contains several different solutes. A red blood cell is placed into each of the following solutions. Indicate whether crenation, hemolysis, or neither will occur. Solution A: 3.21% (m/v) NaCl Solution B: 1.65% (m/v) glucose Solution C: distilled H2O Solution D: 6.97% (m/v) glucose Solution E: 5.0% (m/v) glucose and 0.9%(m/v) NaCl Which solution resutls to CRENATION?
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Solution A, D, E
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Which of the following molecules can cross the lipid bilayer of a membrane directly, without a transport protein or other mechanism? Select all that apply. water ions proteins oxygen carbon dioxide lipids sucrose
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water, oxygen, carbon dioxide, lipids
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Provides a continuous path across the membrane
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Channel Proteins
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Allow water molecules and small ions to flow quickly across the membranes
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Channel Proteins
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Undergo a change in shape to transport solutes across the membrane
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Carrier Proteins
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Transport primarily small polar organic molecules
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Carrier Proteins
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Provide a hydrophilic path across the membrane
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Channel and Carrier Proteins
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Are integral membrane proteins
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Channel and Carrier Proteins
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Transport solutes down a concentration or electrochemical gradient
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Channel and Carrier Proteins