1. Anabolism: This is the building up process. Anabolic reactions use energy to synthesize complex molecules from simpler ones. Think of it like constructing a building - it requires energy to assemble the materials. Some examples include:

* Protein synthesis: Building proteins from amino acids.

* Glycogenesis: Building glycogen (a storage form of glucose) from glucose molecules.

* Lipid synthesis: Building fats from fatty acids and glycerol.

2. Catabolism: This is the breaking down process. Catabolic reactions release energy by breaking down complex molecules into simpler ones. Think of it like dismantling a building - it releases energy stored in the structure. Some examples include:

* Cellular respiration: Breaking down glucose to produce ATP (energy).

* Glycogenolysis: Breaking down glycogen into glucose molecules.

* Lipolysis: Breaking down fats into fatty acids and glycerol.

These two processes work together in a delicate balance to maintain the life of an organism. Anabolism builds the structures and molecules needed for life, while catabolism provides the energy required for these processes.