A) a heterocyclic base and ,orthophosphoric acid
B) an aldopentose, a heterocyclic base and orthophosphoric acid
C) an aldopentose and a heterocyclic base
D) an aldopentose and orthophosphoric acid
Correct Answer: C
Solution :
Nucleic acids (RNA and DNA) are the natural polymer of nucleotides. A nucleiotide. contains a nitrogenous (hetrocyclic) base, an aldopentose (generally ribose and deoxy-ribose) and a phosphate group. The combination of former two units is also called a nucleoside. \[\underbrace{Phosphate+\underbrace{Pentose\,sugar+Base}_{Nucleoside}}_{Nucleotide}\]
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