Refer to the Figure Below

Multiple Choice

Refer to the figure below. The figure shows a signal transduction pathway involving two proteins found in the cytoplasm-JAK and STAT.Based on this figure, what are the roles of JAK and STAT in this pathway?

A) JAK is a G protein and STAT is a transcription factor.
B) JAK is a transcription factor and STAT is a GTPase.
C) JAK is a protein kinase and STAT is a G protein.
D) JAK is a G protein and STAT is adenylyl cyclase.
E) JAK is a protein kinase and STAT is a transcription factor.