Final answer:
Cellulose, hemicellulose, and pectin are typical components of plant cell walls, providing structure and support, while starch is not a component of the wall.
Step-by-step explanation:
The typical components of plant cell walls are cellulose, hemicellulose, and pectin. Cellulose is the most abundant polysaccharide in nature and makes up about 50% of the plant cell wall, providing structural support to the cell. The cell wall also contains hemicellulose polymers which connect to the cellulose filaments, and pectin polymers which create a matrix that embeds the cellulose fibers.
Although starch is also comprised of glucose units similar to cellulose, it is not a component of the cell wall but rather a storage form of glucose in plants. Some plants also have a secondary cell wall which contains both cellulose and lignin, a complex phenolic polymer that adds additional rigidity and support.