Suppose that some cells are grown in culture in the presence…

Suppose that some cells are grown in culture in the presence of radioactive nucleotides for many generations so that both strands of every DNA molecule include radioactive nucleotides. The cells are then harvested and placed in new medium with nucleotides that are not radioactive so that newly synthesized DNA will not be radioactive. What proportion of DNA molecules will contain radioactivity after three rounds of replication?    

The following table shows Chargaff’s data that demonstrates…

The following table shows Chargaff’s data that demonstrates base composition of DNA from different biological sources. Source A T G C E. coli 26.0 26.9 24.9 25.2 Yeast 31.3 32.9 18.7 17.1 Sea urchin 32.8 32.1 17.7 18.4 Rat 28.6 28.4 21.4 21.5 Human 30.3 30.3 19.5 19.9  Which of the following is NOT a general conclusion that is supported by these data?