Which of the following statements is true?
(a) MAP kinase is important for phosphorylating MAP kinase kinase.
(b) PI 3-kinase phosphorylates a lipid in the plasma membrane.
(c) Ras becomes activated when an RTK phosphorylates its bound GDP to create GTP.
(d) STAT proteins phosphorylate JAK proteins, which then enter the nucleus and activate gene transcription.
Answer:
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