Question

Suppose 75 heavy dsDNA molecules replicate twice in a medium containing $N^{14}$. Which of the following is true?

• A. 150 hybrid and 150 normal dsDNA are produced
• B. 75 hybrid and 75 normal dsDNA are produced
• C. 150 hybrid and 75 normal dsDNA are produced
• D. 75 hybrid and 150 normal dsDNA are produced

Answer 1

Answer: (A)

150 hybrid and 150 normal dsDNA are produced

According to the figure, in the first generation, 150 hybrid dsDNA are produced. In second generation 150 hybrid dsDNA and 150 normal dsDNA are produced. in ratio 1:1.

So, the correct answer is "150 hybrid and 10 normal dsDNA are produced".