Final answer:
Lignins are not associated with the primary cell wall but are a key component of the secondary cell wall, providing rigidity and compressive strength to plant structures.
Step-by-step explanation:
The component that is NOT associated with the primary cell wall is E) lignins. Lignins are found in the secondary cell wall, which is deposited after the cell has stopped growing. In contrast, the primary cell wall is composed of cellulose microfibrils, hemicelluloses, pectins, and glycoproteins. Lignin is a rigid material that provides compressive strength, allowing plants to be tall and resist gravity. It is a complex polymer made of phenolic subunits, different from the sugars composing the primary cell wall materials, and it contributes to the longevity and structural integrity of plants after their cells die.