試題詳解

67. Which statement is FALSE for the structural features of nucleotides?
(A) There are two types of bases, purines and pyrimidines.
(B) The most common form of DNA in nature is B-form.
(C) DNA is more stable than RNA.
(D) An A-T base pair has two H-bonds, and a G-C base pair has three H-bonds.
(E) Cytosine, uracil, and thymine belong to purines； adenine and guanine belong to pyrimidines.