Refer to the figure below. 
The figure shows a signal transduction pathway in a cell.Which of the following plays a role in signal transduction in this case?
A) An internal receptor
B) A protein kinase cascade
C) A lipid-derived second messenger
D) A cyclic nucleotide second messenger
E) A calcium channel
Correct Answer:
Verified
Q15: Which statement about ligand‒receptor complexes is false?
A)
Q16: After a signal arrives at a target
Q17: "Crosstalk" refers to the
A) ability of signaling
Q18: In designing a drug to function as
Q19: Refer to the figure below. 
Q21: Refer to the figure below.
Q22: In a signal transduction pathway involving G
Q23: To respond to a signal, a cell
Q24: A molecule functioning as an antagonist binds
Q25: Which of the following has its receptors
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