Question

collectively, reactions that build new molecules are known as
anabolic.
synthetic reactions.
catabolic.
exchange reactions.
metabolic.

Explanation:

Anabolic reactions are those that build new molecules by combining smaller molecules, often requiring energy input. Synthetic reactions also create new compounds but are a more general - chemistry term. Catabolic reactions break down molecules. Exchange reactions involve the swapping of components between molecules. Metabolic reactions include both anabolic and catabolic processes. The specific term for reactions that build new molecules is anabolic.

Answer:

A. anabolic