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

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

AIPMTAIPMT 1992Molecular Basis of Inheritance

Solution:

E. coli fully labelled with ,5N is allowed to grow in l4N medium. The two strands of DNA molecule j of the first generation bacteria have different density and do not resemble parent DNA. Meselson and Stahl, 1958 by using l4N and l5N continued that the replication of DNA in E-coli is semi-conservative in nature.