A(n) _reaction is one that builds large molecules (polymers) from smaller molecules.

This type of reaction requires energy.

Anabolic reactions

Explanation:

Anabolic reactions -

It refers to the type of reaction , where energy in the form of heat or light is required for the reaction to take place , in this type of reaction larger molecules can be formed from smaller reactants , is referred to as anabolic reactions .

These type of reaction takes place along with catabolic reactions , that are responsible to convert the chemical energy into cellular energy , that are needed to start up an anabolic reaction .

Hence , from the given statement of the question ,

The correct answer is anabolic reaction .

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