However, in the form of N2, nitrogen is unusable by all organisms except for a few primitive bacteria that are capable of converting N2 gas to ammonia (NH3). This process of conversion is called nitrogen fixation, and makes the nitrogen available for use by organisms.
1 Simple carbohydrates are often used as building blocks of larger, complex carbohydrates. 2  The empirical structure of simple carbohydrate is C 6 H 12 O 6 or (CH 2 O) 6 while that of complex carbohydrate is (C 6 H 10 O 5) n, in which ânâ is the number of monomer units.
Categories. Digestible carbohydrate includes simple and complex carbohydrates. Simple types may be single sugars, or monosaccharides, and double sugars, or disaccharides, while complex carbohydrates include starches, which are larger molecules.ategories. Digestible carbohydrate includes simple and complex carbohydrates. Simple types may be single sugars, or monosaccharides, and double sugars, or disaccharides, while complex carbohydrates include starches, which are larger molecules.