adenine (A), guanine (G), cytosine (C)
and thymine (T) RNA also contains four bases, the first three bases are
same as in DNA but the fourth one is uracil (U) A unit formed by the attachment of a base to 1¢ position of sugar is
known as nucleoside In nucleosides, the sugar carbons are numbered
as 1¢, 2¢, 3¢, etc