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Escherichia coli fully labelled with .^(...

Escherichia coli fully labelled with `.^(15)N` is allowed to grow in `.^(14)N` medium. The two strands of DNA molecule of the first generation of bacteria have `:`

A

different denesity and do not resermble parent DNA

B

different density but resemble parent DNA

C

same density and resemble parent DNA

D

same density but do not resmble parent DNA

Text Solution

Verified by Experts

The correct Answer is:
B
When E. coli fully labelled with `N^(15)` is allowed to grow in `N^(14)` medium , then after fist genertion of replication one of the two strands would have `N^(15)` and the other strand would have `N^(14)` . The resulting molecule would have a density which is intermediate between `N^(15)` DNA and `N^(14)` DNA.
These two molecules of DNA will be similar but not same in density.
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