Principle of Inheritance and VariationHard
Question
Escherichia coli fully labelled with N15 is allowed to grow in N14 medium. The two strands of NA molecule of the first generation bacteria have
Options
A.different density and do not resemble parent DNA
B.different density but resemble parent DNA
C.same density and resemble parent DNA
D.same density but do not resemble parent DNA
Solution
When E.coli fully labelled with N15 is allowed to grow in N14 medium, then after first generation of replication one of the two strands would have N15 and the other strand would have N14 The resulting molecule would have a density which is intermediate between N15 DNA and N14 DNA.
These two molecules of DNA will be similar but not same in density .
These two molecules of DNA will be similar but not same in density .
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