Question

A $dsDNA$ found in E. coli has $N^{15}$ labeled nitrogen bases. This organism was provided with $N^{14}$ based nitrogen bases for the replication process. The two new DNA molecules are synthesised after one round of replication in the $N^{14}$ based medium. Which of the following optionscorrectly describes the comparison between parent DNA and daughter DNA

	DNA	Density	Sequence of Nucleotides	Radioactivity
1	Parent DNA	Heavy	Same as daughter DNA	Not - radioactive
	Daughter DNA	Hybrid	Same as parent DNA	Not - radioactive
2	Parent DNA	Heavy	Same as daughter DNA	Radioactive
	Daughter DNA	Light	Same as parent DNA	Radioactive
3	Parent DNA	Light	Not the same as daughter DNA	Not - radioactive
	Daughter DNA	Heavy	Not the same as parent DNA	Not - radioactive
4	Parent DNA	Light	Same as daughter DNA	Not - radioactive
	Daughter DNA	Heavy	Same as parent DNA	Not - radioactive

• A. 1
• B. 2
• C. 3
• D. 4

Answer 1

Answer: (A)

Correct answer is (a) 1