Final answer:
Animal cells, although lacking cell walls, have a glycocalyx comprising sugar residues that contribute to cellular functions, unlike the rigid cellulose-based structure in plant cells.
Step-by-step explanation:
While it is true that animal cells lack cell walls, it does not mean that they are completely devoid of sugar molecules. Animal cell membranes include a specialized layer known as the glycocalyx, which contains sugar residues attached to membrane proteins and lipids. The absence of a rigid cell wall allows animal cells more flexibility and the ability to change shape, which is fundamental in processes such as endocytosis and motility. Unlike plant cells, which have a cell wall made of cellulose and other polysaccharides that provide structural support and protection, animal cells rely on the cytoskeleton and extracellular matrix for mechanical support.