Answer to Question 1
B
Answer to Question 2
When a compound breaks down (catabolism), energy is released, whereas when a compound is being formed (anabolism), energy is required. In metabolism, both catabolic and anabolic processes are going on simultaneously. By pairing the reactions in a way that energy released from catabolic reactions can be captured by anabolic reactions that require energy, one reaction can provide the energy required by the other reaction. The most common catabolic reaction that drives metabolism is the breakdown of ATP to ADP, which provides the energy required for many of the biological reactions that occur in our bodies.