Campbell Biology 11th Edition - Valuepack
Campbell Biology 11th Edition - Valuepack
11th Edition
ISBN: 9780134833545
Author: Michael L. Cain, Steven A. Wasserman, Peter V. Minorsky, Jane B. Reece Neil A. Campbell Lisa A. Urry
Publisher: PEARSON
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Chapter 11.3, Problem 3CC

What is the actual “signal” that is being transduced in any Signal transduction pathway, such as those shown in Figures 11.6 and 11.10? In what way is this Information being passed from the exterior to the interior of the cell?

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Researchers have found that a certain signal transduction pathway, illustrated in the figure below, may be responsible for the development of cancer in pancreatic cells. In normal pancreatic cells, where the pathway remains inactive, a membrane-bound receptor called Ptc inhibits a downstream protein known as Smo. The inhibition of Smo blocks the activa- tion of a complex of proteins known as the HSC, which results in the cleaving of one of its proteins called Ci. The cleaving of Ci, in turn, prevents the pathway from initiating the syn- thesis of division-facilitating enzymes. A Ptc B Smo с inhibition D A model of a Ptc signal transduction pathway under normal conditions. HSC Ci cleavage A certain protein called the Hedgehog protein (Hh) is found to activate this signal transduction pathway and trigger uninterruptable cell division. cell division not initiated Which of the following describes the most plausible mechanism by which Hh triggers uninterruptable cell division? Hh binds to…

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Campbell Biology 11th Edition - Valuepack

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