Chains of enzyme reactions that break down or build molecules are called
pathways.

Chain of enzyme reaction that break down or build molecules are called as metabolic pathways.

Explanation:

Metabolic pathways are enzymes which regulates the chemical process. Metabolic pathways are chemical reactions which stimulates a cellular process in the cell.

Usually proteins help these metabolic reactions to take place in a cell. Proteins are necessary for any enzyme to work appropriately.

For any cellular process to work catalysts are important. They need a nudge and a push for the process to happen adequately.