Answer
The answer is letter "A"
Work Step by Step
They bind to receptor proteins.
Biological Science (6th Edition)
by Freeman, Scott; Quillin, Kim; Allison, Lizabeth; Black, Michael; Taylor, Emily; Podgorski, Greg; Carmichael Jeff
Published by
Benjamin Cummings
ISBN 10:
0321976495
ISBN 13:
978-0-32197-649-9
Chapter 7 - Inside the Cell - Review - Page 169: 3
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