Nutritional Classification of Organisms

Organisms live in nature forming complex webs of interactions among themselves and with the environment in which they flourish. 

All organisms require energy to stay alive and grow. Organisms are divided into two major cate- 

Most organisms, however, are unable to use radiant forms of energy and rely instead on the oxidation of chemical compounds as a source of energy. These organisms (called chemotrophs) are divided in two groups on the basis of the type of 

Membrane-bound nucleus absent absent present 

Membrane lipids. Linkage to glycerol ester-linked ether-linked ester-linked 

---