If an E.coli with heavy DNA allow to grow for 80 minutes in a culture
medium of 14 NH 4 Cl, then what would be the proportion of heavy,light and
hybrid densities DNA molecule respectively?
(A) 1/16 : 1/16 : 14/16
(B) 0/16 : 14/16 : 2/16
(C) 1/16 : 14/16 : 1/16
(D) 1/8 : 2/8 : 6/8

After 1 st generation itself, no heavy DNA will be left since the method is semi-conservative so there is no chance of heavy DNA at all after 4th generation which will be completed in 80minutes.

Difficulty Level:

  • 14%
  • 59%
  • 19%
  • 10%