Indicate true (T) and false (F) statements below regarding the Ras-MAP-kinase signaling pathway. Your answer would be a four-letter string composed of letters T and F only, e.g. TTTF.
( ) The immediate early genes turn on a few hours after activation of the RTK.
( ) Ras-GTP binds directly to, and activates, the upstream kinase in the MAP kinase module.
( ) Signal transduction through the Ras-MAP-kinase pathway only leads to a transient response.
( ) In the MAP kinase module, Raf can be phosphorylated by Erk to create a negative feedback loop.