Cell metabolism is the breaking down (catabolism) and building up (anabolism) of molecules. Catabolism releases energy to be used in anabolism.
Catabolism is like bulldozing a building because it breaks down a big building into smaller bits like how catabolism breaks down a big molecule into smaller molecules.
Anabolism is like a crane because it builds up small buildings into large towers like how anabolism builds up smaller molecules into bigger molecules.
Catalyzes anabolism and catabolism to make the chemical reactions faster to sustain life