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.
Simple carbohydrates are composed of single-unit sugars called monosaccharides and disaccharides. Glucose and fructose are examples of common monosaccharides. Simple carbohydrates are easily digested and converted to sugar rapidly in the bloodstream.wo types of complex carbohydrates are particularly important for nutrition: 1  Starch: Starch is a polysaccharide that plants use to store energy. 2  Dietary Fiber: Dietary fiber is found in plants as cellulose, pectin, and lignin.