Answer
A.
Work Step by Step
When G proteins are activated by receptors, they immediately bind GTP (A.). All of the other steps listed come later in the part of cell signalling involving G proteins.
Biology (11th Edition)
by Raven, Peter; Johnson, George; Mason, Kenneth; Losos, Jonathan; Singer, Susan
Published by
McGraw-Hill Education
ISBN 10:
1259188132
ISBN 13:
978-1-25918-813-8
Chapter 9 - Cell Communication - Review Questions - Understand - Page 185: 8
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