A) Identify a signaling molecule from the model present. Explain how receptors play a role in cell differentiation. B) Identify the dependent variable and two controls the experimenters used when conducting this experiment.

C) Evaluate if the number of Variant 1-Type cells with mating projections was significantly different from those of the Wild Type. Use chi-square analysis.

D) Scientists propose that a mutation has occurred that either changed the mating pheromone or receptor site on the Variant 1-Type yeast cells. Predict where the mutation occurred. Justify your prediction with evidence from the experiment and scientific reasoning, based on your knowledge of cell-signaling pathways.