Answered: In Caulobacter crescentus development,…

Human Anatomy & Physiology (11th Edition)

11th Edition

ISBN:9780134580999

Author:Elaine N. Marieb, Katja N. Hoehn

Publisher:Elaine N. Marieb, Katja N. Hoehn

Chapter1: The Human Body: An Orientation

Section: Chapter Questions

Problem 1RQ: The correct sequence of levels forming the structural hierarchy is A. (a) organ, organ system,...

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In Caulobacter crescentus development, several proteins are directly involved in generating cell polarity which includes PleC, DivJ, and DivK. These proteins were discovered through genetics, but they are essential genes; which means, cells cannot survive long-term in their absence. However, temperature-sensitive and cold-sensitive mutants have enabled researchers to observe the consequences of the absence of these proteins before the cells die. For each one, answer the following questions: A) What are the consequences (phenotypes) when the function of the protein is lost? Generally these will involve, but are not limited to, positioning of the flagella, pili, and stalk. B) Based on the mechanism of development of cell polarity involving phosphorylation and dephosphorylation of DivK, how do these phenotypes arise?

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