Don’t get the point of the question... An bacteria which divids every 15 minutes

Question

Don’t get the point of the question... An bacteria which divids every 15 minutes is grown in a medium containing radioactive adenine (A*). After each single adenine is labelled, the bacteria are transferred to a medium containing nonradioactive adenine (A). Following one round of DNA replication in the nonradioactive medium, the DNA is analysed. Which of the following sequences could represent this DNA? (A)A*A*TTGA TC (B)AA TTGA TC TTAACTAG (C)A*ATTGA TC TTA*A*CTAG (E)A*A*TTGA"TC TTAA*CTAG (D)AATTGATC TTAACTAG TTA*A*CTA*G

Explanation / Answer

Answer: Option A is correct.
Explanation:
DNA replication occurs in a semiconservative manner. The daughter DNA duplex produced contains one parental strand and one newly synthesized strand.
It is given that a bacterium is initially grown in the "Ade*" medium and shifted to normal "Ade" containing medium. So, The DNA duplex contains after one round of replication contains one "Ade*" strand and one "Ade" strand.

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