Given diagram depicts the experiment of Meselson and Stahl. Identify the type of isotopic DNA formed after 40 minutes (A, B, C and D).
A B C D
1 ¹⁴N DNA ¹⁵N DNA ¹⁴N DNA ¹⁵N DNA
2 ¹⁴N DNA ¹⁵N DNA ¹⁴N DNA ¹⁴N DNA
3 ¹⁴N DNA ¹⁴N DNA ¹⁵N DNA ¹⁵N DNA
4 ¹⁴N DNA ¹⁵N DNA ¹⁵N DNA ¹⁵N DNA

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A-¹⁴N-DNA, B-¹⁵N-DNA, c-¹⁴N-DNA, D-¹⁵5N-DNA

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answer is B.

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Detailed Solution

In Meselson and Stahl experiment after 40 minutes , there will be formation of 50% hybrid DNA and 50% light DNA . here in given diagram A-DNA and D-DNA are light DNA ( both the strands are with ¹⁴N),B-DNA and C-DNA are hybrid DNA (one strand is with ¹⁴N and another strand is with ¹⁵N).As D-DNA is light DNA ,there is no ¹⁵N strand in D-NA .

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