dna isolated from bacterial virusM13 has 25%A 33%T 22%C 20%G.what sense do they make?

Answer 1

Do your own homework.

This requires understanding Chargaff's law and the type of DNA genome that it applies to.

Answer 2

There is a wayu of sub-catagorising organisms according to the GC%; the GC% in this case is only 42% which is really quite low. Typically for bacteria such as Streptococcus, you can expect GC of 70

Answer 3

I don't see that it makes much of any sense at all. It's not the percentage of different bases that counts -- it's the organization. There may be a general classification scheme based on percentages of the various bases, but I have not heard of it.