Campbell Biology (11th Edition)

Published by Pearson
ISBN 10: 0-13409-341-0
ISBN 13: 978-0-13409-341-3

Chapter 11 - 11.4 - Concept Check - Page 229: 3


Cells have proteins called receptors that bind to signaling molecules and start a physical response. This is due to membrane receptors that interact with both extracellular signals and molecules within the cell, they permit signaling molecules to affect cell function without actually entering the cell.

Work Step by Step

The key here is to review earlier parts of the chapter and see the antagonistic roles of kinases and phosphatases.
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