If the polysaccharides are composed of the same monosaccharides, how do they differ?

Monosaccharides are simple sugar unit molecules, whereas polysaccharides are enormous, linking thousands of sugar units. Monosaccharides provide cells with short-term energy. Polysaccharides provide long-term energy storage and rigid structure to cell walls and exoskeletons of animals.

examples of nucleic acids are deoxyribonucleic acid (dna) and ribonucleic acid (rna).