Answer: DNA is a double-stranded, helical nucleic acid molecule capable of replicating and determining the inherited structure of a cell's proteins. It's found in the nucleus of the cell.
Explanation: Basically, if you look at DNA, you'll see that it has two strands which seem to twist (making it a helix, hence the term "helical"). If you uncoiled a strand of DNA, it would look like a ladder. The "rungs" of the ladder are called base pairs (adenine-thymine, guanine-cytosine) held together by a hydrogen bond. A goes to T, and G goes to C.
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