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.
Simple carbohydrates are composed of small molecules generally monosaccharaides and disaccharides, which are rapidly absorbed such as glucose and sucrose. Simple carbohydrates has a high glycemic index and increases blood glucose level rapidly resulting in high insulin levels and more hunger. Complex carbohydrates are larger molecules which are broken down to monosaccharaides e.g. starches and fibers. Complex carbohydrates has a low glycemic index, increases blood glucose level more slowly but for a longer time resulting in lower insulin level and less hunger.