User blog comment:Sparklyplatypus/"Are You Smarter Than an Xth Grader?"/@comment-3522343-20111115225052/@comment-3126828-20111116025548

1) Nucleotides

2)Nitrogen base, pentose sugar, and pentose (5 carbon) sugar

3)Because chromosomes are DNA that is wrapped up.

I hope I got it right because I'm about to have a test on it in two days.