Question: Which of the following statements, regarding Ras, is incorrect? Answer

Question: Which of the following statements, regarding Ras, is incorrect?
Answers:
a) Ras is a GPCR (G protein coupled receptor)
b) Mitogenic signaling results in phosphorylation of Ras
c) the difference between wild-type, proto-oncogenic ras and mutant, oncogenic Ras is that mutant Ras is constitutively phosphorylated and activated
d) activated Ras uses GTP to phosphorylate target proteins in a kinase cascade.
e) all of the above
The answer here is all of the above. Is there a mistake in this question? It seems to me like all are true. If not, could you explain why these are not true?

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