1. Methanal only contains two of the three distinguishing features of a carbohydrate. In addition to containing a carbonyl group and an empirical formula of CH2O carbohydrates must also contain at least two -OH groups.2. Source of energy; storage of energy, precursors (for other important biological molecules) and dietary fibre3. The –OH group on the fifth carbon atom forms an ether linkage with the first carbon atom...