💊 PCAT Exam Prep

Receptor tyrosine kinases (RTKs) signal through:

A Ion channels
B Autophosphorylation and activation of intracellular signaling cascades
C G-proteins only
D Direct DNA binding

✓ Correct Answer: Option B

RTKs dimerize upon ligand binding, autophosphorylate, then activate downstream pathways (RAS-MAPK, PI3K).

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