4.1 Monosaccharides Classification Monosaccharides consist typically of three to seven carbon atoms and are described either as aldoses or ketoses(suffix -ose means saccharide),depending on whether the molecule contains an aldehyde function or a ketone group 4.1 ·Monosaccharides Classification Monosaccharides consist typically of three to seven carbon atoms and are described either as aldoses or ketoses(suffix –ose means saccharide), depending on whether the molecule contains an aldehyde function or a ketone group