Knowledge About the Tautomeric Forms of the Bases of Nucleic

Knowledge about the tautomeric forms of the bases of nucleic acids is needed

A) to understand H-bonding between the complementary bases
B) to understand how the bases are linked to ribose.
C) to understand how bases are linked to deoxyribose.
D) to understand the ability of nucleotides to act as energy carriers.
E) to distinguish the 5'-end of a DNA strand from the 3'-end.