The right answer is:
A ==> phosphate group
B ==> pentose
C ==> nitrogenous base
A nucleotide is composed of three parts:
* A nucleotide variable depending on the type of nucleotide (purine or pyrimidine) attached to the carbon 1' of the pentose;
* pentose: a sugar with five carbon atoms ;
* a phosphate group (or phosphoric acid), identical for the nucleotides of DNA and RNA, attached to the 5 'carbon atom of the pentose, and to the 3' carbon atom of the nucleotide pentose following).
