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Which of the following is the heavy isotope of nitrogen?

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in Biology – Class 12 by (271k points)
Which of the following is the heavy isotope of nitrogen?

(a) ^14N

(b) ^15N

(c) ^13N

(d) ^16N

I had been asked this question in a national level competition.

This question is from The Experimental Proof of Replication of DNA topic in chapter Molecular Basis of Inheritance of Biology – Class 12

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The correct choice is (b) ^15N

The explanation: Mathew Meselson and Franklin Stahl grew Escherichia coli in a medium containing ^15NH4Cl as the only source of nitrogen for many years together. The isotope of nitrogen in this compound is ^15N. It is said to be the heavy isotope of nitrogen.

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