AP BIOLOGY

Detailed explanation-1: -Anabolism and catabolism are the two broad classes of biochemical reactions that make up metabolism. Anabolism is the synthesis of complex molecules from simpler ones. These chemical reactions require energy. Catabolism is the breakdown of complex molecules into simpler ones.

Detailed explanation-2: -Metabolic pathways can be broadly divided into two categories based on their effects. Photosynthesis, which builds sugars out of smaller molecules, is a “building up, ” or anabolic, pathway. In contrast, cellular respiration breaks sugar down into smaller molecules and is a “breaking down, ” or catabolic, pathway.