試題詳解

40. Which of the following is not a typical component of a signal-transduction pathway such as the one involved in producing the greening response?

(A) activation of enzymes that produce second messengers such as cGMP

(B) G-proteins acting as transcription factors that activate specific genes

(C) activation of a G-protein by an activated receptor protein

(D) phosphorylation of transcription factors

(E) protein kinase cascades