what is the difference between catabolism and anabolism?

Catabolism (Greek kata = downward + ballein = to throw) is the set of metabolic pathways that break down molecules into smaller units and release energy.[1] In catabolism, large molecules such as polysaccharides, lipids, nucleic acids and proteins are broken down into smaller units such as monosaccharides, fatty acids, nucleotides and amino acids, respectively. As molecules such as polysaccharides, proteins and nucleic acids are made from long chains of these small monomer units (mono = one + mer = part), the large molecules are called polymers (poly = many).

Anabolism (Greek "mound" from ana = upward + ballein = "to throw") is the set of metabolic pathways that construct molecules from smaller units.[1] These reactions require energy. One way of categorizing metabolic processes, whether at the cellular, organ or organism level is as 'anabolic' or as 'catabolic', which is the opposite. Anabolism is powered by catabolism, where large molecules are broken down into smaller parts and then used up in respiration. Many anabolic processes are powered by adenosine triphosphate (ATP).

*Anabolism
 -the set of metabolic pathways that construct molecules from          smaller units. These reactions require energy.

*Catabolism
 -the set of metabolic pathways that break down molecules into smaller units and release energy.

Catabolism requires ATP

Anabolism releases ATP