試題詳解

23. DNA double helix structure is stabilized by all of the following EXCEPT:
(A) the sugar-phosphate backbones are oriented in opposite directions.
(B) the glycosidic bonds holding paired bases are directly across the helix from one another.
(C) cations such as Mg2⁺ bind to the anionic phosphates.
(D) bases stack together through hydrophobic interactions and van der Waals forces.
(E) appropriate base pairing builds a polymer whose external dimensions are uniform.