In the Watson-Crick Model of DNA Structure (Now Called B-Form

Multiple Choice

In the Watson-Crick model of DNA structure (now called B-form DNA) :

A) a purine in one strand always hydrogen bonds with a purine in the other strand.
B) A-T pairs share three hydrogen bonds.
C) G-C pairs share two hydrogen bonds.
D) the 5' ends of both strands are at one end of the helix.
E) the bases occupy the interior of the helix.