LIFE SCIENCE

Detailed explanation-1: -Nucleic acids are biological macromolecules which are polymers of repeating monomeric units called nucleotides. A single nucleotide includes a nitrogenous base, a sugar molecule and a phosphate group. A nitrogenous base with a sugar molecule alone makes up a nucleoside.

Detailed explanation-2: -Nucleic acids are polynucleotides-that is, long chainlike molecules composed of a series of nearly identical building blocks called nucleotides. Each nucleotide consists of a nitrogen-containing aromatic base attached to a pentose (five-carbon) sugar, which is in turn attached to a phosphate group.