Biological Science (7th Edition)
7th Edition
ISBN: 9780134678320
Author: Scott Freeman, Kim Quillin, Lizabeth Allison, Michael Black, Greg Podgorski, Emily Taylor, Jeff Carmichael
Publisher: PEARSON
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Chapter 6, Problem 9TYPSS
PROCESS OF SCIENCE In an experiment, you create two groups of liposomes in a solution containing 0.1M NaCl—one made from red blood cell membranes and the other from frog egg cell membranes. When the liposomes are placed in water, those with red blood cell membranes burst more rapidly than those made from egg membranes. Evaluate each of the following statements and identify those that could explain these results.
• T/F The red blood cell liposomes are more hypertonic relative to water than the frog egg liposomes.
• T/F The red blood cell liposomes are more hypotonic relative to water than the frog egg liposomes.
• T/F The red blood cell liposomes contain more aquaporins than the frog egg liposomes.
• T/F The frog egg liposomes contain ion channels, which are not present in the red blood cell liposomes.
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Sassa, a biology professor, wanted to demonstrate to her students the applicability of a dialyzing membrane (DM) as a model for the cell membrane by enclosing an aqueous solution in a DM bag and immersing in a beaker containing a different solution. Substances available which are permeable to the DM include 0.02 M NaCl, 0.03 M glucose, and 0.01 M glucose. The only substance available which is completely impermeable to the DM is the 0.01 M lactose. Using the substances given and materials such as a beaker, stirring rod, and string, draw ONLY ONE set-up that can be demonstrated by Ms. Sassa that will satisfy ALL of the following conditions:a. No solute will exhibit a net diffusion out of the cell.b. Glucose will exhibit a net diffusion into the cell.c. NaCl will exhibit a zero net d. No net movement of lactose from the inside to outside of the cell.
Make sure to label properly the substance inside the beaker and inside the DM bag.
Osmosis Practice Activity
Osmosis is the diffusion of water from an area of high concentration to an area of low concentration.
Only water moves in osmosis! The diagrams below show the concentration of water and salt inside
the cell and the concentration of water and salt surrounding the cell. Complete the sentences below
by comparing the concentration of the water inside the cell and the concentration outside the cell.
1.
a. Water will flow
the cell, out of the cell, in both directions).
(into
5% NaCl
95% H20
95% NaCI
5% H20
b. The cell will
(shrink,
burst, stay the same).
a. Water will flow
(into the cell.
2.
5% NaCl
out of the cell, in both directions).
5% NaCl
95% H20
95% H20
b. The cell will
(shrink, burst,
stay the same).
A researcher is isolating proteins from a cell via different techniques. They find that when the cell is ground with a blender, all of the proteins in the cell can be extracted. However if instead the cell membranes are agitated in a 1.2 M KCl mixture, only about 70% of the total protein is extracted.What class of membrane proteins are in this soluble extract and what forces normally hold them to the membrane?What class of membrane proteins are the 30% of proteins that remain behind, and what forces hold these proteins in the membrane?
If a solution of ionic solids was not available, what other solvent systems could be used to extract these proteins?
Chapter 6 Solutions
Biological Science (7th Edition)
Ch. 6 - 1. How do the phospholipids in archaea differ from...Ch. 6 - If a solution surrounding a cell is hypertonic...Ch. 6 - Prob. 3TYKCh. 6 - 4. Integral membrane proteins are anchored in...Ch. 6 - 5. Cooking oil lipids consist of long, unsaturated...Ch. 6 - Prob. 6TYUCh. 6 - 7. In terms of structure, how do channel proteins...Ch. 6 - 9. PROCESS OF SCIENCE In an experiment, you create...Ch. 6 - Prob. 11PIATCh. 6 - Prob. 12PIAT
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