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  • Ten E.coil cell with are incubated in medium containing

Ten E.coil cell with _{}^{15}\textrm{N}-ds\;DNA are incubated in medium containing _{}^{14}\textrm{N} nucleotide. After 60 minutes, how many E,coil cells will have DNA totally free from _{}^{15}\textrm{N}?

Option: 1

40 cells


Option: 2

60 cells


Option: 3

80 cells


Option: 4

20 cells


Answers (1)

best_answer

60 minutes is 3 cycles as 20 min in one cycle. Thus, it is 3 generations

 

1st

2nd

3rd

N15

N15

N15 N14

N15 N14

N14 N14

N15

N14

N14 N14

N14 N14

N14 N14

 

N15

N15 N14

N15 N14

N14 N14

 

N14

N14 N14

N14 N14

N14 N14

In 3rd Generation, 6 cells will be free of N15. This is related to 1 E.coli. Q says 10 Ecoli hence it is 6 X 10 = 60 cells

Posted by

Nehul

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