Is monosaccharides One feature of all DNA molecules?

No, monosaccharides are not a feature of all DNA molecules. DNA is primarily composed of nucleotides, which consist of a sugar (specifically deoxyribose in DNA), a phosphate group, and a nitrogenous base. While deoxyribose is a type of sugar, it is not classified as a monosaccharide in the same way that glucose or fructose are; instead, it is a pentose sugar. Thus, the structure of DNA is characterized by its unique nucleotide arrangement rather than by the presence of monosaccharides.