Which of the following statements about anabolic and catabolic reactions is true?

Anabolic reactions are metabolic processes that build complex molecules from simpler ones, and they require an input of energy to drive these reactions. These processes include the synthesis of proteins from amino acids or the production of glucose during photosynthesis, where energy is needed to form new bonds between atoms.

In contrast, catabolic reactions break down complex molecules into simpler ones, releasing energy in the process. This energy release typically occurs because the breakdown of molecules, such as during cellular respiration, allows for the conversion of potential energy stored in chemical bonds into usable forms like ATP (adenosine triphosphate).

Therefore, the statement that anabolic reactions require energy input while catabolic reactions release energy accurately reflects the nature of these metabolic pathways, highlighting the fundamental differences in how organisms utilize energy during these processes.