What type of reaction is characterized by the breakdown of larger molecules into smaller ones, releasing energy?

• A. Dehydration synthesis
• B. Hydrolysis reaction
• C. Catabolic reaction
• D. Anabolic reaction

Answer: (C)

The breakdown of larger molecules into smaller ones while releasing energy is characteristic of a catabolic reaction. Catabolic reactions involve the degradation of complex molecules, such as carbohydrates, proteins, and fats, into simpler units. During this process, energy stored in the chemical bonds of these larger molecules is released, which can then be harnessed by the organism for various cellular activities, including maintaining homeostasis and driving endergonic (energy-requiring) reactions.

In contrast, anabolic reactions are the opposite, as they involve the synthesis of larger molecules from smaller ones, requiring an input of energy. Dehydration synthesis refers specifically to the process of joining smaller molecules (like monosaccharides) into larger ones (like polysaccharides) while releasing water, further emphasizing its anabolic nature. Hydrolysis reactions involve the breakdown of compounds through the addition of water, also leading to smaller molecules, but they do not necessarily characterize the broader energy-releasing aspect inherent to catabolism. Therefore, the correct identification of catabolic reactions aligns perfectly with the definition provided in the question.