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.
1. Simple Carbohydrates: Simple carbohydrates have a simple molecular structure and are made up of 1 or 2 sugar molecules. These are carbs laden foods that can be digested easily by the system due to their simple structure. On consumption, these sugars are quickly absorbed by the body in the form of glucose.