What+is+DNA

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Each base is also attached to a sugar molecule and a phosphate molecule. Together, a base, sugar, and phosphate are called a nucleotide. Nucleotides are arranged in two long strands that form a spiral called a double helix.=====

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An important property of DNA is that it can replicate, or make copies of itself. Each strand of DNA in the double helix can serve as a pattern for duplicating the sequence of bases. This is critical when cells divide because each new cell needs to have an exact copy of the DNA present in the old cell.=====

DNA is contained in blood, semen, skin cells, tissue, organs, muscle, brain cells, bone, teeth, hair, saliva, mucus, perspiration, fingernails, among an array of other things as well.
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This nucleic acid is capable of self replication, and it also contains the code necessary for synthesizing RNA, another critical nucleic acid. It also contains sets of base pairs which come together to create the genetic code, determining things like eye color and body structure. When DNA  becomes altered by a substance known as a mutagen, it can cause health problems. Some mutagens have an impact on DNA  in the eggs and sperm, or on developing organisms, causing them to develop birth defects. Others can change living organisms, contributing to the development of a variety of health problems. Mutagens often introduce errors at the copying stage, which means that these errors will be replicated numerous times as the damaged DNA  perpetuates itself.