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.
Two types of carbohydrates, in sort of a high level grouping, can be broken down into simple and complex carbohydrates.Some simple carbohydrate are table sugar and glucose, w â¦ hile more complex carbohydrates are something starchy, like pasta and other grain foods.Complex carbohydrates like starch are simply polymers of shorter monomer units like glucose. Another type of carbohydrate is fibrous carbohydrates, such as fiber.wo types of carbohydrates, in sort of a high level grouping, can be broken down into simple and complex carbohydrates.