If cells are provided with nucleotides labeled with a radioactive isotope of hydrogen (³H),newly synthesized DNA will be radioactively labeled.In a set of experiments,a student-faculty research team introduced labeled T nucleotides into a culture of dividing human cells at specific times.Following a 30-minute incubation with the radiolabeled nucleotides,cells were lysed,and the DNA was isolated and tested for presence of radioactivity.Which of the following questions might be answered by such a method? A)How many cells are produced by the culture per hour? B)What is the duration of the S phase of the cell cycle? C)What is the duration of mitosis? D)How many picograms of DNA are contained in each nucleus?

Question

Quizplus · Accepted Answer

The introduction of labeled T nucleotides allows for the tracking of the synthesis of DNA during the S phase of the cell cycle. By determining the duration of time during which radioactivity is incorporated into the DNA, the duration of the S phase can be estimated.

If Cells Are Provided with Nucleotides Labeled with a Radioactive