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.
As a dietitian, I'm often asked to explain the difference between simple and complex carbohydrates. While most people have heard that complex carbohydrates are better for you than simple carbohydrates, what's often unclear is how the two differ, and why the differences between the two affect your health. There are three types of carbohydrates: starch, sugar and fiber. Starches and sugars provide your body with its main source of energy.