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【单选题】
11-1-10*如果15N标记的大肠杆菌转入14N培养基中生长了三代,其各种状况的DNA分子比例下列哪一项: 纯15N 15N-14N 纯14N -DNA 杂种DNA -DNA
A.
1/8 1/8 6/8
B.
1/8 0 7/8
C.
0 1/8 7/8
D.
0 2/8 6/8
E.
0 4/8 4/8
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