Energy cycle or metabolism
A cell has small molecules that are denoted as micromolecules also large molecules that is denoted as macromolecules. The chemical equations of a living mechanism might be categorized into two major types
(a) The chemical equations through which the big substances are continually broken down into smaller ones are known as catabolism.
(b) The chemical equations through which the macromolecules are synthesised in the cell are known as anabolism.
The primary energy found in living cells is chemical power that may be easily saved, transferred and transformed. For this, the living cells comprise a chemical substance named adenosine triphosphate abbreviated as ATP. It is stated as energy currency of living cells as it may trap, save and free small packets of power with ease.