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Q.

What is indicated by ‘c’ in the figure?

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a

Heavy DNA

b

Hybrid DNA

c

Light DNA

d

Heavy and hybrid DNA

answer is B.

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Detailed Solution

Meselson and Stahl conducted experiment to prove semi conservative method of replication . They allowed to grow heavy(N15) bacteria  in light medium(N14 )Thus, the DNA that was extracted from the culture one generation after the transfer from 15N to 14N medium [that is after 20 minutes; E. coli divides in 20 minutes] had a hybrid or intermediate density. 

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