Which of the following is a typical first event in signal transduction pathways?
A.
Activation of an intracellular enzyme
B.
Binding of a signaling molecule to a cell surface receptor
C.
Release of calcium ions from intracellular stores
D.
Phosphorylation of a target protein
Exam No：AP Biology Problem Set 2 Year：2024 Question No：AP Biology2024AP0206
Answer:
B
Knowledge points:
4.2 Introduction to Signal Transduction
Solution:
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