Question

if double stranded DNA with N^15 undergoes replication twice in a normal medium then

Answer 1

(B) all four........................

Answer 2

If double stranded DNA with N^15 undergoes replication twice in a normal medium then all four contain N^15 in DNA.

Explanation:

• DNA replication is based on the semiconservative nature of DNA, where two copies of the replicated DNA, where each copy conserves one half of the parent DNA molecule.
• In this case, when the DNA molecule is replicated first time in the N^15 medium, half of the DNA will aquire the N^15 in them.
• When this DNA undergoes replication again in the same medium, each strand separates, and each of them will be paired with another complementary strand containing N^15 in them.
• Hence the correct answer is option b.