137k views
2 votes
In planet Aggieus DNA replication is known to be conservative. Researchers kept replicating alien bacteria in media supplied with 15N and then isolated a single bacteria and placed it into 14N containing media.

After three divisions how many bacterial cells would contain 15N DNA?

User Leader
by
8.3k points

1 Answer

5 votes

Answer:

1 bacterial cell would contain 15N DNA

Step-by-step explanation:

According to conservative model of DNA replication, the two DNA strands do not separate from each other and direct the synthesis of entirely new DNA molecule.

Here, a single bacteria had 15N DNA strands and then it was placed in N14 media. All the subsequent divisions would utilize 14N.

After one division: One 15N DNA and one 14N DNA

After two divisions : One 15N DNA and three 14N DNA

After three divisions: One 15N DNA and seven 14N DNA

Hence only one bacterial cell will contain 15N DNA

User Mirco
by
7.5k points
Welcome to QAmmunity.org, where you can ask questions and receive answers from other members of our community.