Biological Science (6th Edition)
6th Edition
ISBN: 9780321976499
Author: Scott Freeman, Kim Quillin, Lizabeth Allison, Michael Black, Emily Taylor, Greg Podgorski, Jeff Carmichael
Publisher: PEARSON
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Chapter 2, Problem 14PIAT
Summary Introduction
To explain:
The mechanism by which antifreeze protein (AFP) prevents cells from freezing solid.
Introduction:
The freezing of water molecules causes the formation of four hydrogen bonds at one time. This results in the formation of the low-density ice crystals. The formation of the crystals can be prevented by the formation of the hydrogen bonds.
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Diffusion experiments of a small molecule drug in tissue samples are performed. The drug has a radius of 2.24 nm and a pure-water diffusivity of 2.75 x 10^-6 cm^2/s. Cells occupy approximately 72% of the tissue byvolume. The molecule is very hydrophilic and does not readily cross cellular membranes. If you assume that the interstitial space is gel-like with a microstructure parameter k=3.7 x 10^-3 nm^-1, what is the effective diffusivity in the tissue?
Osmosis and Red Blood Cells
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Results: Red blood cells look intact and normal in the 0.9% solution. In the 1.5% solution cells are present but look shriveled. In the 0 and 5% NaCl solutions, you do not see any cells at all!
Exercise #2: Explain the results.
Exercise #3: Would you expect to see the same effect as above on plant cells within intact plant tissue? Explain your answer.
Chapter 2 Solutions
Biological Science (6th Edition)
Ch. 2 - Which of the following occurs when a covalent bond...Ch. 2 - If a reaction is exothermic, then which of the...Ch. 2 - 3. Which of the following is most likely to have...Ch. 2 - Prob. 4TYKCh. 2 - 5. Which of the following molecules would you...Ch. 2 - Locate fluorine (F) on the partial periodic table...Ch. 2 - Prob. 7TYUCh. 2 - Prob. 8TYUCh. 2 - Prob. 9TYPSSCh. 2 - From what you have learned about water, why do...
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