Which Statement Best Describes the Action of Polypeptide Growth Factors

Which statement best describes the action of polypeptide growth factors?

A) They bind to intracellular receptors and trigger intracellular signal transduction pathways.
B) They bind to cell surface receptors and trigger intracellular signal transduction pathways.
C) They bind to cell surface receptors which phosphorylate cyclins.
D) They make a complex with an intracellular receptor which then acts as a transcription factor.

Correct Answer:

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