In a DNA molecule:
a) there are two antiparallel strands of nucleotides; these strands are joined together by hydrogen bonds. One of the nucleotide strands runs in the 5' to 3' direction and the other runs in the 3' to 5' direction.
b) because of the rules of base pairing, one of the strands of DNA can always serve as the template for the synthesis of the other strand.
c) the hydrogen bonds holding the strands of nucleotides together can be broken in a process called denaturation or melting.
d) all of above
