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Molecular Basis of Inheritance

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Advanced Botany

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Biological Classification
  1. 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
    1. different density and do not resemble parent DNA
    2. different density but resemble parent DNA
    3. same density and resemble parent DNA
    4. same density but do not resemble parent DNA
Correct Option: A

After one generation in 14N medium DNA of bacteria settled at a level intermediate between heavy and light bands due to semi conservative DNA replication.


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