
Use the figure to answer the following question.
In the late 1950s, Meselson and Stahl grew bacteria in a medium containing "heavy" (radioactive) nitrogen (¹³N) and then transferred them to a medium containing ¹⁴N (non-radioactive) . Which of the results in the figure would be expected after one round of DNA replication in the presence of ¹⁴N?
A) A
B) B
C) C
D) D
Correct Answer:
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