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How does lignin differ from cellulose in plant tissues?
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polymer
Industrial polymers are synthesized from simple compounds joined together to form long chains. For example, polyvinyl chloride is an industrial homopolymer synthesized from repeating units of vinyl chloride.
Lignin and cellulose are both essential components of plant tissues, but they differ significantly in their chemical composition and biological functions.
- Chemical Structure: Cellulose is a linear polysaccharide composed of thousands of glucose molecules linked end to end, forming flat, ribbonlike structures that bundle into microfibrils. In contrast, lignin is a complex, non-carbohydrate phenolic compound made of a mixture of three distinct monomers.123
- Structural Role: Cellulose provides the primary tensile strength of the cell wall. Lignin acts as a matrix that adds compressive strength and stiffness to the cell wall, which helped terrestrial plants evolve to withstand the forces of gravity.13
- Additional Functions: Beyond structural support, lignin serves to waterproof xylem tissues to facilitate water transport and provides protection against fungi through its antifungal properties. Cellulose is primarily recognized for its remarkable biological stability and its role as a fundamental structural building block.32