Which of the following structural characteristics is not normally observed in a DNA duplex?
(a) purine-pyrimidine pairs
(b) external sugar-phosphate backbone
(c) uniform left-handed twist
(d) antiparallel strands
Answer: C
Which of the following structural characteristics is not normally observed in a DNA duplex?
(a) purine-pyrimidine pairs
(b) external sugar-phosphate backbone
(c) uniform left-handed twist
(d) antiparallel strands
Answer: C