Microbiology: An Evolving Science (Fourth Edition)
4th Edition
ISBN: 9780393615098
Author: John W. Foster, Joan L. Slonczewski
Publisher: W. W. Norton & Company
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Chapter 27.3, Problem 1TQ
Summary Introduction
To review:
The development of fusaric acid sensitivity.
Introduction:
Efflux pumps in the bacteria are the transporters which are proteinaceous in nature and embedded in the plasma membrane. They play an important role in the recognition of the harmful agents and expel them before they reach their target. The efflux pumps also act as the passageway for harmful compounds from within the bacterial cells to the outside environment.
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If 17 Beta estradiol can diffuse through cell membranes, explain why all cell types are not sensitive to the presence of 17 beta estradiol?
Amoeboid cells that migrate through our tissues, such as the class of white blood cells known as neutrophils, often do so in a directed manner, triggered, for instance, by chemical signals released by pathogens such as bacteria. Directed migration in response to a chemical stimulus is known as chemotaxis. Part of an efficient chemotactic response is the ability of cells to polarize. As is the case with our structurally-polar polymers like F-actin or microtubules, polarization here refers to an asymmetry in the cells, rather than an electrical charge. In this case, it involves one part of the cell becoming the “front” (or leading edge) and another the rear. In a well-polarized, migrating cell, it’s been observed that an active form of Rac (which, in turn, can activate ARP 2/3) is concentrated towards the front of the cell, whereas an active form of Rho (which, in turn, can activate formin, inhibit cofilin/ADP, and activate myosin II) is found toward the rear of the cell. Based on your…
Amoeboid cells that migrate through our tissues, such as the class of white blood cells known as neutrophils, often do so in a directed manner, triggered, for instance, by chemical signals released by pathogens such as bacteria. Directed migration in response to a chemical stimulus is known as chemotaxis. Part of an efficient chemotactic response is the ability of cells to polarize. As is the case with our structurally-polar polymers like F-actin or microtubules, polarization here refers to an asymmetry in the cells, rather than an electrical charge. In this case, it involves one part of the cell becoming the “front” (or leading edge) and another the rear. In a well-polarized, migrating cell, it’s been observed that an active form of Rac (which, in turn, can activate ARP 2/3) is concentrated towards the front of the cell, whereas an active form of Rho (which, in turn, can activate formin, inhibit ADP, and activate myosin II) is found toward the rear of the cell. Based on your…
Chapter 27 Solutions
Microbiology: An Evolving Science (Fourth Edition)
Ch. 27.1 - Prob. 1TQCh. 27.1 - Prob. 2TQCh. 27.1 - Prob. 3TQCh. 27.1 - Prob. 4TQCh. 27.2 - Prob. 1TQCh. 27.2 - Prob. 2TQCh. 27.2 - Prob. 3TQCh. 27.3 - Prob. 1TQCh. 27.3 - Prob. 2TQCh. 27.3 - Prob. 3TQ
Ch. 27.3 - Prob. 4TQCh. 27.4 - Prob. 1TQCh. 27 - Prob. 1RQCh. 27 - Prob. 2RQCh. 27 - Prob. 3RQCh. 27 - Prob. 4RQCh. 27 - Prob. 5RQCh. 27 - Prob. 6RQCh. 27 - Prob. 7RQCh. 27 - Prob. 8RQCh. 27 - Prob. 9RQCh. 27 - Prob. 10RQCh. 27 - Prob. 11RQCh. 27 - Prob. 12RQCh. 27 - Prob. 13RQCh. 27 - Prob. 14RQCh. 27 - Prob. 15RQCh. 27 - Prob. 16RQCh. 27 - Prob. 17RQCh. 27 - Prob. 1TQCh. 27 - Prob. 2TQCh. 27 - Prob. 3TQCh. 27 - Prob. 4TQ
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