Most chemical changes in a cell result from chains and cycles of biochemical reactions, with each step controlled by a separate, specific enzyme

Metabolism is the totality of the chemical reactions which occur within a cell, and can be divided into two types:

• Anabolic reactions involve the synthesis of complex molecules from simpler ones and usually require energy to form new bonds (endergonic)
• Catabolic reactions involve the breakdown of complex molecules into simpler ones and usually release energy from breaking bonds (exergonic). Submit here

Energy Transformations

• Energy in living cells is stored and released in the chemical form of ATP (adenosine triphosphate)
• ATP is made up of an RNA nucleotide (base = adenine) bonded to two additional phosphate groups (three in total)
• These additional phosphates are connected by high energy bonds that release a large amount of free energy when hydrolysed
• The energy released from the hydrolysis of ATP (into ADP + P_i) can be used by the cell to fuel biochemical processes. https://www.scitechnol.com/submitmanuscript-biochemical-bioprocess-engineering-journal.php