A biologist is analyzing the cell cycle of a particular line of HeLa cancer cells in a culture, where one complete cell cycle takes 18 hours.
Figure 1 shows the relative proportion of time spent in each of the three stages of this cell cycle (Stage X, Stage Y, and Stage Z).
a.[2]
What percentage of the total time of the cell cycle is spent in Stage X?
b.[2]
If a single HeLa cell divides to form two new cells every 18 hours, how many hours will it take for one original cell to divide and form a group of 64 cells?