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 have very simple chemical structures and are made of small molecules. 2  Complex carbohydrates have very complex structures while the molecules are large, unlike simple carbohydrates.
Carbohydrate chart is classified as Simple and Complex carbohydrates. This classification is dependent on the chemical structure of the food and how quickly it gets absorbed by the body. Simple carbohydrates have single or double sugars in their chemical structure while complex carbohydrates have three or more sugars.he common monosaccharides include glucose, fructose and galactose. Glucose is the main sugar which is metabolized by the body to produce energy. Galactose is identical to glucose in structure except for one hydroxyl group of carbon atom.