What is a primary function of carbohydrates in living organisms?

• A. Energy storage and structural support
• B. Catalyzing chemical reactions
• C. Insulating nerve cells
• D. Synthesizing amino acids

Answer: (A)

Carbohydrates play a crucial role in living organisms primarily through their function in energy storage and providing structural support. They are organic molecules composed of carbon, hydrogen, and oxygen, and can be classified into simple sugars or complex polymers.

In terms of energy storage, carbohydrates such as glucose are fundamental as they serve as an immediate energy source for cells. When organisms need quick energy, they break down glucose. Additionally, polysaccharides like glycogen in animals and starch in plants serve as long-term energy storage forms, which can be broken down into glucose when energy is needed.

Moreover, carbohydrates provide structural support in various forms. In plants, cellulose—a complex carbohydrate—forms the cell wall, granting strength and rigidity. In arthropods and fungi, chitin serves a similar structural role. Thus, carbohydrates not only supply energy but also contribute significantly to the structural integrity of cells and organisms, highlighting their primary functions in biological systems.