-A Space Probe Returns with a Culture of a Microorganism

Multiple Choice

-A space probe returns with a culture of a microorganism found on a distant planet. Analysis shows that it is a carbon-based life-form that has DNA. You grow the cells in ¹⁵N medium for several generations and then transfer them to ¹⁴N medium. Which pattern in the figure above would you expect if the DNA was replicated in a conservative manner?

A) A
B) B
C) C
D) D
E) E