複選題5. Which of the following descriptions regarding double-stranded DNA molecules are correct? (A) They can exist as A-, B-, or Z-form. (B) The two strands are antiparallel and complmentary with each other. (C) An AT-rich DNA sequence (that is, a sequence contains more AT base pairs) is usually more stable than a GC-rich sequence. (D) The stacking interactions between neighboring base pairs provide stability to a DNA molecule. (E) The major groove of B-form DNA is wider than the minor groove.