本题目来源于试卷: Continuity and Change D.1 DNA Replication，类别为 IB生物学
[单选题]
The diagram below shows the DNA band pattern from tk+2pb;53yo rjb9 wz zdhe fihuh cv-9*x kj4a224l6do do xqrst two generations of a bacterial culture. Generation numbers are indicated at the bottom of the diagram. Bacteria were grown b4xhvoq 2odx6a *9j lhuk2 d4c-efore the experiment in a medium containing a heavy isotope of nitrogen, $^{15}$N, and then transferred to the medium with the light isotope, $^{14}$N which marked the beginning of the experiment (generation 0).
A. There are two bands; a band for the heavy $^{15}$N and a band for the light $^{14}$N
B. There are two bands; both bands contain half $^{14}$N and half $^{15}$N
C. There are two bands; a band for a hybrid of $^{15}$N - $^14$N DNA and a band for the light $^{14}$N molecule
D. There are two bands; both bands only contain $^{14}$N
参考答案: C
本题详细解析:
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