Which of the following are accurate statements regarding the structure of DNA? Check all that apply.

A) DNA is a single-stranded molecule.
B) Nucleotides are the building blocks of a DNA molecule.
C) The four types of nucleotides in DNA are adenine, guanine, cytosine, and uracil.
D) The bases within a DNA molecule are connected together by hydrogen bonds.
E) The specific pairing of bases within a DNA molecule is known as complementary base pairing.