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Q.

If E.coli was allowed to grow for 80 minutes (Meselson and Stahl experiment) then what would be the proportions of light and hybrid densities DNA molecules ?

 LightHybrid
1)142
2)62
3)302
4)622

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a

2

b

1

c

3

d

4

answer is A.

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Detailed Solution

Generation time for E.coli cells is 20minutes.

Therefore, No. of generation is 80minutes=80/20=4.

Meselson and Stahl started with Heavy DNA and grew the E.coli cells in a 14NH4Cl.

Therefore after 4 generations, 14 were light and 2 were hybrid DNAs. 

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