Energy cycle or metabolism
A cell has small molecules (micromolecules) as well as large molecules (macromolecules). The chemical equations of a living mechanism may be divided into main two types
(1) The chemical equations by which the big substances are constantly broken down into smaller ones are called catabolism.
(2) The chemical equations by which the macromolecules are synthesised within the cell are called anabolism.
The primary energy found in living cells is chemical power, which may be easily saved, transformed and transferred. For this, the living cells have a chemical substance named adenosine triphosphate (ATP). It is stated as energy currency of living cells because it may trap, save and free small packets of power with ease.
ATP has of a purine base known as adenine linked to a five carbon sugar named ribose which is further attached to three molecules of phosphate.
ATP is energy rich molecule this is because of the presence of four negatively charged oxygen atom very close to one another. These four negatively charged o-molecules experience very high repulsive energy.
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ADP can change to ATP in the presence of inoraganic phosphate. This process is called phosphorylation.
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