Final answer:
The tional saturation of sites (Y) is the ratio of bound ligands to total binding sites on a protein. It is represented by the ligand concentration at which the binding site is half occupied.
Step-by-step explanation:
The tional saturation of sites (Y) refers to the ratio of bound ligands to total binding sites. In other words, it represents the degree to which the binding sites on a particular protein are occupied by ligands. This can be visualized using a saturation curve, where the Y value indicates the ligand concentration at which the binding site is half occupied.
For example, in the case of tetracycline binding to sensor RNA, the Y value would represent the ligand concentration at which 50% of the sensor RNA is bound with tetracycline.