If Cells Are Provided with Nucleotides Labeled with a Radioactive

question 49

Multiple Choice

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?

---

Definitions:

Interest Rate

The percentage at which interest is charged or paid on a sum of money over a period of time.

Loanable Funds

This refers to the total amount of funds available for borrowing in the financial markets, determined by the saving rate and investment demands.

Equilibrium Interest Rate

The rate of interest where the quantity of money sought equals the amount available, equilibrating investment and savings across the economy.

Loanable Funds

The funds in financial markets that are available for borrowing, reflecting the relationship between the demand for and supply of these funds.