Cellular respiration is a complex series of chemical reactions, but you are not asked to describe these reactions. You are asked to use only the information provided in the question. Dehydration reactions lead to the formation of larger molecules from smaller components, and water is released in the process. Hydrolysis reactions are the opposite— larger molecules are broken down into smaller components by the action of water. Enzymes are involved, but you are not asked to take that fact into account.
