Explain the difference between anabolic and catabolic pathways.

A. Anabolic pathways occur in the mitochondria, while catabolic pathways occur in the nucleus.

B. Anabolic pathways release energy while catabolic pathways build molecules.

C. Anabolic pathways are involved in digestion, while catabolic pathways are for growth.

D. Anabolic pathways build molecules and require energy; catabolic pathways break down molecules and release energy.