Becker's World of the Cell (9th Edition)
9th Edition
ISBN: 9780321934925
Author: Jeff Hardin, Gregory Paul Bertoni
Publisher: PEARSON
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Chapter 8, Problem 8.7PS
QUANTITATIVE Sodium Ion Transport. A marine protozoan is known to pump sodium ions outward by a simple ATP-driven Na+ pump that operates independently of potassium ions. The intracellular concentrations of ATP, ADP, and Pi are 20, 2, and 1 mM, respectively, and the membrane potential is –75 mV.
(a) Assuming that the pump transports three sodium ions outward per molecule of ATP hydrolyzed, what is the lowest internal sodium ion concentration that can be maintained at 25°C when the external sodium ion concentration is 150 mM?
(b) If you were dealing with an uncharged molecule rather than an ton, would your answer for part a be higher or lower, assuming all other conditions remained the same? Explain.
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Students have asked these similar questions
Multiple Choice. Imagine a solution containing only water, sodium, and glucose. If a voltage is applied to the solution, glucose would move:
(a) There would be no net movement of glucose
(b) In the opposite direction of sodium
(c) In the same direction and speed as sodium
(d) In the same direction as sodium, but slower.
(e) In the same direction as sodium, but faster.
Matching Question:
Match the following statements (designated I-1l) that describe various types of transport across biological membranes with the features of the corresponding processes:
I. Free unassisted water diffusion through the lipid bilayer of the biomembrane.
II. Glucose transport via the glucose transporter in the plasma membrane.
III. Pumping of protons across the lysosome membrane by a proton pump similar to the ATP-synthase complex.
Note that some of the items from the answer list should NOT be used.
1. Only
2 Only i1
v Process that requires a dedicated transmembrane transporter/channel
v Process that occurs down the concentration gradient
- Process that establishes a concentration gradient
3. Only i
41 and
v Process that is energy dependent
51 and
6.Il and i
71. and iN
Only a few. Why do only a small number of sodium ions need to flow
through the Na+Na* channel to change the membrane potential
significantly?
Chapter 8 Solutions
Becker's World of the Cell (9th Edition)
Ch. 8 - What is the difference between the concentration...Ch. 8 - Prob. 8.2CCCh. 8 - A researcher is studying a fern that is shown to...Ch. 8 - How are carrier proteins and channel proteins...Ch. 8 - How would you determine whether a specific...Ch. 8 - Both the Na+/glucose symporter and the Na+/K+ pump...Ch. 8 - You are studying the energetics of transport of...Ch. 8 - True or False? Indicate whether each of the...Ch. 8 - Telling Them Apart. From the following list of...Ch. 8 - Mechanisms of Transport. For each of the following...
Ch. 8 - Prob. 8.4PSCh. 8 - Prob. 8.5PSCh. 8 - Prob. 8.6PSCh. 8 - QUANTITATIVE Sodium Ion Transport. A marine...Ch. 8 - Prob. 8.8PSCh. 8 - Prob. 8.9PSCh. 8 - QUANTITATIVE The Calcium Pump of the Sarcoplasmic...Ch. 8 - Inverted Vesicles. An important advance in...Ch. 8 - Ouabain Inhibition. Ouabain is a specific...
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