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If E. coli were allowed to grow in the c...

If E. coli were allowed to grow in the culture medium for 80 minutes by Matthew Meselson and Franklin Stahl in their experiments, the proportion of light and hybrid density DNA molecule would have been

A

87.5% of light density DNA and 12.5% of hybrid density DNA

B

75.0% of light density DNA and 25% of hybrid density DNA

C

50% of light density DNA and 50% of hybrid density DNA

D

12.5% of light density DNA and 87.5% of hybrid density DNA

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Answer the following questions based on Meselson and Stahl's experiment of E. coli : (a) Write the name of the chemical substance used as the only source of nitrogen in the experiment. (b) Why did they allow the synthesis of the light and the heavy DNA molecules in the organism ? (c ) How did they distinguish the heavy DNA molecules from the light DNA molecules? Explain. (d) Write the conclusion the scientists arrived at, at the end of the experiment.

The proof for semiconservative mode of DNA replication was First provided by Matthew Meselson and Franklin Stahl. Escherichia coli were the first organism to be used for this experiment and then it was done in with higher organisms such as plants and human cells. The process of DNA replication in terms of energy is a very expensive process. It involves the formation of a replication fork. Given below is a graph showing the percentage of Adenine in two different double stranded DNA. Helicase helps in: