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 40, Problem 14PIAT
Summary Introduction
To review:
The results related to the activity of Na+/K+-ATPase (sodium/potassium adenosine triphosphatase) in the gills of the fish exposed to aluminum and its comparison with the control fish.
Introduction:
The Na+/K+- ATPase is the enzyme, which works as a pump, and is found in the plasma membrane of the cell. Its function is to allow the movement of sodium ions out of the cell and potassium ions into the cell. Scientists exposed freshwater bony fish (Prochilodus lineatus) exposed to water with high aluminum level and another set of fish that was exposed to water with normal aluminum levels (control). The results of the data are shown in graph below:
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-Inhibitor
+Inhibitor
[S] (mM)
Vη&νβσπ: (μmol/sec).
ν0&νβσπ;&νβσπ:(μmol/sec)
0.0001
33
17
0.0005
71
50
0.001
83
67
0.005
96
91
0.01
98
95
What is the TYPE of iinhibitor?
Intestinal epithelial cells pump glucose into the cell against its concentration gradient using the Nat-glucose symporter. Recall
that the Na+ concentration is significantly higher outside the cell than inside the cell. The symporter couples the "downhill"
transport of two Na+ ions into the cell to the "uphill" transport of glucose into the cell.
If the Na+ concentration outside the cell ([Na+]out) is 155 mM and that inside the cell ([Na+ lin) is 21.0 mM, and the cell
potential is -52.0 mV (inside negative), calculate the maximum energy available for pumping a mole of glucose into the cell.
Assume the temperature is 37 °C.
AGgluc
=
kJ
mol
What is the maximum ratio of [glucose] in to [glucose]out
that could theoretically be produced if the energy
coupling were 100% efficient?
O 2700
7.89
O 1.14
3.7 x 10-4
Chapter 40 Solutions
Biological Science (7th Edition)
Ch. 40 - Prob. 2TYKCh. 40 - 3. What effect does antidiuretic hormone (ADH)...Ch. 40 - Fill in the blank: In Gila monsters, the organ in...Ch. 40 - Prob. 5TYUCh. 40 - Prob. 6TYUCh. 40 - Prob. 7TYUCh. 40 - 8. Scientists have noted that marine invertebrates...Ch. 40 - Prob. 9TYPSSCh. 40 - Prob. 10TYPSSCh. 40 - Prob. 11PIAT
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