How does the transduction occur for taste?

Explanation:

The transduction of sweet-tasting compounds involves the activation of G-protein-coupled receptors (GPCRs) on the apical surface of taste cells (see Figure 15.13). ... Both of these pathways for the perception of sweetness can co-exist in the same taste cell.

well when looking at this if you think about it   negativley and positivley   react with each other and when the first layer gets full they add layers it starts with 2 on the first layer and it constantly goes on until the official number is there