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.
The Difference Between Carbs & Calories. All calories come from either fat, protein or carbohydrates. Photo Credit Purestock/Purestock/Getty Images. Without calories, the human body does not get the energy it needs to continue to fuel itself.All calories come from either fat, protein or carbohydrates.There are many types of carbohydrates. The term carbohydrate is commonly used to reference foods that are relatively high in carbohydrates in relation to protein and fat content.ithout calories, the human body does not get the energy it needs to continue to fuel itself. All calories come from either fat, protein or carbohydrates. There are many types of carbohydrates.