Nucleosides that has 1 or more phosphate group attached to the 5-carbon sugar.
a. macromolecules
b. nucleotides
c. pyrimidine
d. purine
e. x-ray crystallography

b. Nucleotides  

Explanation:

The process mentioned above refers to the nucleotide bond in the process called phosphodiester bonds.

At such linkages, the nucleotides are linked to form phosphate bridges to each other. The pentose carbon-3 hydroxyl group (5-carbon sugar) of the first nucleotide joins the second nucleotide pentose carbon-5 hydroxyl-linked phosphate group via the phosphodiester bond. In this way, the nucleotides join together, constituting a deoxyribonucleic acid ribbon.

dna is made up of six smaller molecules -- a five carbon sugar called deoxyribose, a phosphate molecule and four different nitrogenous bases (adenine, thymine, cytosine and guanine).