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Discussion

Receptor tyrosine kinases transmit a signal by

  • A.opening an ion channel in the plasma membrane
  • B.diffusing into the nucleus along with the signal
  • C.cleaving cyclic AMP molecules into adenosine
  • D.phosphorylating tyrosine residues on themselves

Answer: D

Binding causes two receptors to pair and phosphorylate each other, creating docking sites for relay proteins. The insulin receptor and many growth factor receptors work this way. Cross-phosphorylation between the paired receptors starts the cascade.

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