Which of the following is the first thing that happens when a signal m – McqOptions

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1.	Which of the following is the first thing that happens when a signal molecule acts on a target cell?
A.	A transcription factor acts on the DNA.
B.	The signal molecule binds to RNA.
C.	A new protein is made in the target cell.
D.	The signal molecule binds to a receptor.
Answer» E.

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