Final answer:
After a 48-hour incubation, the 35p is most likely found in the supernatant of saccharomyces cerevisiae.
Step-by-step explanation:
After a 48-hour incubation of saccharomyces cerevisiae in a nutrient medium containing the radioisotope 35p, the 35p would most likely be found in the supernatant. In the centrifugation process, the pellet contains the solid components, while the supernatant contains the liquid components. Since radioisotopes are typically dissolved in liquid, it is more likely to be found in the supernatant.