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sesenic [268]
3 years ago
8

Bacteria are grown in N15 over time, then switched to growth in N14 medium. After three divisions (60 min) what is the percentag

e of bacterial cells that have N15 labeled DNA? (A) 100% (B) 50% (C) 25% (D) 10% (E) 5%
Biology
1 answer:
ozzi3 years ago
8 0

Answer:

C. 25%

Explanation:

A bacterial cell gives rise to two daughter cells by one division. If a single bacterial cell enters into cell division, it will form a total of 2^3= 8 cells after three rounds of cell division. The two DNA strands of the parent DNA duplex having N15 will be present in two bacterial cells out of the total 8 cells. This would occur since the process of DNA replication forms a new DNA duplex with one parental strand and one new strand. So, after three round of cell division 25% cells will have DNA with N15 (2/8 x 100= 25%)

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