Mastering Microbiology with Pearson eText -- Standalone Access Card -- for Microbiology with Diseases by Body System (5th Edition)
5th Edition
ISBN: 9780134618470
Author: Robert W. Bauman Ph.D.
Publisher: PEARSON
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Textbook Question
Chapter 3, Problem 3VI
A scientist who is studying passive movement of chemicals across the cytoplasmic membrane of Salmonella enterica serotype Typhi measures the rate at which two chemicals diffuse into a cell as a function of external concentration. The results are shown in the following figure. Chemical A diffuses into the cell more rapidly than does B at lower external concentrations, but the rate levels off as the external concentration increases. The rate of diffusion of chemical B continues to increase as the external concentration increases.
- a. How can you explain the differences in the diffusion rates of chemicals A and B?
- b. Why does the diffusion rate of chemical A taper off?
- c. How could the cell increase the diffusion rate of chemical A?
- d. How could the cell increase the diffusion rate of chemical B?
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This graph shows facilitated diffusion of a compound across a cytoplasmic membrane and into a cell. As the external concentration of the compound is increased, the rate of uptake increases until it reaches a point where it slows and then begins to plateau. This is not the case with passive diffusion, where the rate of uptake continually increases as the solute concentration increases. Why does the rate of uptake slow and then eventually plateau with facilitated diffusion?
Which of the following scenarios would result in the SLOWEST rate of diffusion?
A. 1 molecule on the outside of a cell membrane, while 10 molecules are inside
B. 8 molecules on the outside of a cell membrane, while 5 molecules are inside
C. 12 molecules on the outside of a cell membrane, while 2 molecules are inside
D. 20 molecules on the outside of a cell membrane, while 10 molecules are inside
In the diffusion of dye in water experiment, what variable did we test for that affected rate of diffusion? How did it affect rate of diffusion?
a
viscosity; higher viscosity results in slower rate of diffusion
b
temperature; higher temperature results in slower rate of diffusion
c
viscosity; higher viscosity results in faster rate of diffusion
d
temperature; higher temperature results in faster rate of diffusion
Chapter 3 Solutions
Mastering Microbiology with Pearson eText -- Standalone Access Card -- for Microbiology with Diseases by Body System (5th Edition)
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