試題詳解

63. cAMP regulates the transcription of many genes. What is the major mechanism for this action?
(A) It induces the phosphorylation of transcription factors.
(B) It binds directly to cAMP response elements in promoters and enhancers.
(C) It mediates this effect by increasing the calcium concentration in the cytoplasm and the nucleus.
(D) It binds directly to nuclear transcriptionfactors.
(E) It induces the phosphorylation of STAT proteins, thus enabling them to translocate into the nucleus.