Which of the following was used by Hershey and Chase to prove that $DNA$ is the chemical basis of heredity
AIIMS 1993, Medium
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d It's Obvious.
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Escherichia coli fully labelled with $15 \mathrm{~N}$ is allowed to grow in $14 \mathrm{~N}$ medium. The two strands of $DNA$ molecule of the first generation bacteria have