• 072920 77839
  • info@smartachievers.in
Menu
Back
  • JEE ADVANCE
  • JEE MAIN
  • NEET
  • BITSAT
  • CBSE BOARD
  • UP BOARD
  • CUET
JEE ADVANCE
  • CLASS XI - XII
  • CRASH COURSE
CRASH COURSE
JEE MAIN
  • CLASS XI - XII
  • CRASH COURSE
CRASH COURSE
NEET
  • CLASS XI - XII
  • CRASH COURSE
BITSAT
  • CLASS XI - XII
CBSE BOARD
  • CLASS IX
  • CLASS X
  • CLASS XI
  • CLASS XII
  • CLASS VI
  • CLASS VII
  • CLASS VIII
UP BOARD
  • CLASS IX
  • CLASS X
  • CLASS XI
  • CLASS XII
CUET
  • CRASH COURSE
Courses


Solution


Q.

Ten E. coli cells with N15-dsDNA are incubated in medium containing N14 nucleotide. After 60 minutes, how many E. coli cells will have DNA totally free from N15      [2022]
1 20 cells  
2 40 cells  
3 60 cells  
4 80 cells  

Ans.

(3)

E. coli divides in 20 minutes. After 60 minutes, generation III would have 75% DNA completely free from N15 and 25% of DNA would be hybrid N14/N15. So, out of 80 cells formed, 60 cells will be free from N15 DNA.