Which of the following elements is not present in a nitrogenous base?

A

Hydrogen

B

Carbon

C

Phosphorus

D

Nitrogen

The nitrogen base present in nucleic acids has nitrogen, carbon, hydrogen and oxygen in the ring structure. Two types of nitrogen bases occur. They are-
1) Purines which have a double ring structure. They are adenine and guanine.
2) Pyrimidines, which have a single ring structure. They are thymine, cytosine and uracil.
Phosphorus forms a part of the nucleotides in thenucleic acid but it is not a part of the nitrogenous base.Thus the correct answer is option C.