Question

Each of the following is a good functional match between animal and plant extracellular structures or fibers except

A) elastins-extensins.
B) extracellular matrix-cell wall.
C) collagens-cellulose.
D) proteoglycans-hemicelluloses.
E) fibronectins-pectins.

Answer 1

The correct answer is E) fibronectins-pectins as they do not serve functionally equivalent roles in animals and plants, with fibronectins part of animal extracellular matrix and pectins being part of plant cell walls.

Step-by-step explanation:

The question asks for a mismatch between animal and plant extracellular structures or fibers, where the following are good functional matches except one.

• Elastins in animals and extensins in plants.
• The extracellular matrix in animals and the cell wall in plants.
• Collagens in animals and cellulose in plants.
• Proteoglycans in animals and hemicelluloses in plants.
• Fibronectins in animals and pectins in plants.

The mismatch is E) fibronectins-pectins because fibronectins are involved in cell adhesion within the extracellular matrix of animal cells, while pectins are components of the plant cell wall that provide rigidity but do not serve a directly comparable function in terms of cell adhesion as in animals.