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11. The DNA extracted from a bacteriophage consists of 24 percent A, 30 percent T, 20...

11. The DNA extracted from a bacteriophage consists of 24 percent A, 30 percent T, 20 percent G and 26 percent C. what is unusual about this DNA? What can you conclude about its structure?

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Answer #1

Answer 11.
This DNA does not seem to follow Chargaff's Rule which states that state that DNA from any cell of any organisms should have a 1:1 ratio of pyrimidine and purine bases and, more specifically, that the amount of guanine should be equal to cytosine and the amount of adenine should be equal to thymine.
What we could conclude about its structure is that it is most likely to be an ssDNA-based virus since that way there is no reason for base complementarity to obey Chargaff's rule. This phenomena has been observed before and is termed "Szybalski's rule".

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