what compounds are the building blocks of dna
Nitrogenous bases, phosphate and pentose sugar. Nitrogenous bases, phosphate and pentose sugar are building blocks of DNA. The nitrogenous bases are purines and pyramidines. The purines are adenine guanine, while the pyramidines are cytosine and thymine. The pentose sugar, phosphate and one nitrogenous base form a long chain called polynucleotide chain.