Which statement characterizes endergonic reactions?

• A. DeltaG negative
• B. DeltaG positive
• C. DeltaG positive, energy used, anabolic, active transport
• D. They occur spontaneously

Answer: (C)

Endergonic reactions require energy input because their Gibbs free energy change is positive. That means they don’t happen on their own; energy must be supplied, often by coupling to an energy-releasing (exergonic) process. This fits biosynthetic (anabolic) pathways that build complex molecules and processes like active transport that move substances against their concentration or electrochemical gradients. So describing endergonic reactions as having positive ΔG with energy used, and being associated with anabolic processes or active transport, captures why they require energy and do not occur spontaneously.