Biology (11th Edition)

Published by McGraw-Hill Education
ISBN 10: 1-25918-813-2
ISBN 13: 978-1-25918-813-8

Chapter 9 - Cell Communication - Review Questions - Apply: 3

Answer

C.

Work Step by Step

A. is false because there are many different second messengers produced by many different receptors/pathways downstream from receptors, the opposite of what A. says. B. is wrong because "different isoforms" refers to very similar receptors, which is not what the question is asking about. D. can be eliminated because different receptors do not all use the same signalling pathway.
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