Which compound acts as a structural component in connective tissues?

Hyaluronic acid is a glycosaminoglycan that plays a crucial role as a structural component in connective tissues. It is a long-chain polysaccharide composed of repeating disaccharide units and is found in various tissues, including cartilage, skin, and synovial fluid. Its unique structure allows it to trap water, providing hydration and resilience to tissues. This property contributes significantly to the gel-like consistency of the extracellular matrix, supporting tissue integrity and facilitating nutrient exchange.

In contrast, starch, sucrose, and glucose serve different biological functions. Starch is a polysaccharide primarily used for energy storage in plants. Sucrose is a disaccharide that acts as a sugar source for energy but does not have structural roles in connective tissues. Glucose, a simple sugar, is essential for energy metabolism but does not provide structural support in the way that hyaluronic acid does. Thus, hyaluronic acid is the key compound responsible for the structural properties of connective tissues.