What are the functions of nucleotides?

(l) They are building blocks of nucleic adds, ribonucleotides for RNAs while deoxyribonucleotides produce DNA.
(2) Cyclic AMP functions as second chemical messenger in many hormone controlled chemical reactions.
(3) Cyclic GMP is functional in Ca++ or calmodulin mediated chemical reaction.
(4) CoA is produced by reaction between nucleotide
and pantothenic add.