[Campbell Biology P.167] What is the primary function and composition of the middle lamella ... | Practice Question
What is the primary function and composition of the middle lamella in plant cells?
A: It is a strong, protective layer made of lignin, found only in woody plants.
B: It is the most abundant glycoprotein in the extracellular matrix of animal cells, involved in cell-cell adhesion.
C: It is a thin layer rich in sticky polysaccharides called pectins that glues adjacent cells together.
D: It forms the main structural component of the plant cell wall, preventing excessive water uptake.
Explanation
The middle lamella is a thin layer located between the primary walls of adjacent plant cells. It is rich in sticky polysaccharides called pectins, which act as a 'glue' to hold neighboring cells together. This is crucial for tissue integrity in plants.