2019-6-22 · A carbohydrate (/ k ɑːr b oʊ ˈ h aɪ d r eɪ t /) is a biomolecule consisting of carbon (C), hydrogen (H) and oxygen (O) atoms, usually with a hydrogen–oxygen atom ratio of 2:1 (as in water) and thus with the empirical formula C m (H 2 O) n (where m may be different from n).This formula holds true for monosaccharides.Some exceptions exist; for example, deoxyribose, a sugar component of ...