Which complex carbohydrate chain contains straight-chain structures?

Amylose is the correct choice because it primarily consists of long, straight-chain structures formed by α-1,4 glycosidic bonds between glucose units. This linear arrangement allows amylose to form a helical structure, which is important in its function as a storage polysaccharide in plants. The straight-chain nature of amylose contrasts with amylopectin, which is branched and contains both α-1,4 and α-1,6 glycosidic bonds, leading to its more complex structure. While cellulose is also a polysaccharide, it is composed of β-1,4 glycosidic bonds, which results in straight, rigid chains that are not the same type of structure we see in amylose. Glycogen, similar to amylopectin, has a highly branched structure with multiple chains, making it distinctly different from the linear chains of amylose.