What is the general function of carbohydrates in living organisms?

The correct choice highlights the primary role of carbohydrates in living organisms, which is to store energy. Carbohydrates serve as a vital energy source; they can be broken down through metabolic processes to release energy that cells need to function properly. In addition to providing immediate energy, carbohydrates can be stored for future use, primarily in the form of glycogen in animals and starch in plants. This stored energy can be mobilized when needed, allowing organisms to access a quick source of energy during periods of high demand.

Carbohydrates also contribute to structural components in cells, such as in the formation of cell walls in plants through cellulose, but their most fundamental function lies in energy storage and supply. This distinguishes them from the other options provided, which pertain to different biological functions. For example, the role of transporting genetic information is primarily associated with nucleic acids, and insulation is related to lipids, while cellular respiration, although it involves the breakdown of carbohydrates, does not represent the primary function of carbohydrates itself.