all of them
Yes, all cells contain DNA because it is necessary for life. DNA codes the RNA which makes the proteins that determine essentially ever characteristic of an organism and the parts of the cell. Tissues are made of cells, so the individual cells contain DNA. Note: in prokaryotic cells, the DNA is not contained in the nucleus, but they DO have DNA, it just floats around freely in the cytoplasm.
Once the DNA is contaminated by a virus, the cell will release a chemical to signal other cells of the contamination. This is how the local region of cells find out if there is any DNA damage to a cell. As for the body as a whole, you wouldn't find out until cells have already begun dying.
DNA
You would not find any cells inside a virus. A virus is a small infectious particle and is actually much smaller than most cells. You will find either DNA or RNA in a virus, but never both.
Any cells can be used as you will find DNA in almost all of them (a few exceptions are red blood cells, platelets, etc.) but even where one specific cell in a tissue has no DNA many adjacent cells in the sample will have DNA.
A cells nucleus, mitochondria or a chloroplast may contain the DNA.
I would say that the location of the DNA in your cells are at the nucleus of the cell.
There would not be enough DNA to put in daughter cells, since DNA synthesis is the replication of DNA.
The opposite of DNA would be non-DNA, such as RNA, which is another nucleic acid that plays a role in protein synthesis and gene regulation in cells.
DNA is found in all cells and therefore in all organs, however, if strand by stand of DNA is counted, then the organ with the most cells would have the most DNA.
In all cells you will find, DNA, Plasma membrane, Cytoplasm, and Ribosomes.
All cells contain DNA (even cells with no nuclei have mithcondria which encode their own genome). thymus cells have an especially high amount of DNA since they serve as a place where T cells mature.