|(This applies to questions 8, 9 and 10) |
A scientist grows cells for 10 minutes in the presence of glucose that includes radioactive Carbon (14C). She harvests 1/2 of the cells right away, and the other half she waits an additional 10 minutes before harvesting.
She gently breaks the cells open and follows the purification scheme indicated. At the initial time point, she finds most of the radioactivity in the supernatent even after the final spin.
The most likely explanation for this is: