(c) Identify the plasmid that must contain the CD3 core promoter sequence but the fewest or no negative regulatory sequences. Based on the data in Figure 2 describe the most likely cause of the variation in luciferase actritty among the cells that contain plasmids PCD34-419, pCD3--309, pCD3--239, and pCD3--199. Calculate the approximate percent increase in luciferase activity between cells containing plasmid pCD3--50 and cells containing plasmid pCD3--149. Round to the nearest whole number. ​