What two cell-surface receptors are represented in the two simplified diagrams below (from left to right)?
A) TGFβ receptor and TNF receptor.
B) Cytokine receptor and TNF receptor.
C) TNF receptor and TGFβ receptor.
D) TGFβ receptor and cytokine receptor.
E) Cytokine receptor and TGFβ receptor.

Question

What two cell-surface receptors are represented in the two simplified diagrams below (from left to right)? 
A) TGFβ receptor and TNF receptor. 
B) Cytokine receptor and TNF receptor. 
C) TNF receptor and TGFβ receptor. 
D) TGFβ receptor and cytokine receptor. 
E) Cytokine receptor and TGFβ receptor.

Quizplus · Accepted Answer

Both the cytokine receptor (left) and the TGFβ receptor (right) are enzyme-coupled receptors and are noncovalently associated with cytosolic tyrosine kinases and serine/threonine kinases, respectively. Activated STATs form dimers, whereas activated R-Smads can form dimers or trimers with a co-Smad. Both of these phosphorylated complexes enter the nucleus and regulate the expression of their target genes.

What Two Cell-Surface Receptors Are Represented in the Two Simplified