Bio 1 Chapter 7

Transport primarily small polar organic molecules

Carrier Proteins

Undergo a change in shape to transport solutes across the membrane

Carrier Proteins

Allow water molecules and small ions to flow quickly across the membranes

Channel Proteins

Provides a continuous path across the membrane

Channel Proteins

Are integral membrane proteins

Channel and Carrier Proteins

Provide a hydrophilic path across the membrane

Channel and Carrier Proteins

Transport solutes down a concentration or electrochemical gradient

Channel and Carrier Proteins

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

Solution A

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?

Solution A, D, E

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?

Solution B, C

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

Solution D

What name is given to the process by which water crosses a selectively permeable membrane? phagocytosis osmosis pinocytosis passive transport diffusion

osmosis

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

water, oxygen, carbon dioxide, lipids