Answer
These receptors would bind to signal steroids, such as estrogen for intracellular receptors and water-soluble ones for tyrosine kinases which would tell the cell to pass through the G2 checkpoint on to M phase.
Work Step by Step
The key here is to review Ch. 11 on cellular signalling and see how those transduction pathways could carry the signal to tell cells to divide. Also review, early in that chapter, the two kinds of receptors based on the hydrophobicity of the ligands which they bind.
