Question

which is a molecule found in plant extracellular matrices but not in animal cell extracellular matrices?
cellulose
polysaccharides
collagen
keratin
proteoglycans

Explanation:

Cellulose is a major component of plant cell walls and extracellular matrices. Animals do not have cellulose in their extracellular matrices. Polysaccharides are present in both plant and animal extracellular matrices in different forms. Collagen is a major protein in animal extracellular matrices. Keratin is a protein found in animal - derived structures like hair and nails. Proteoglycans are also common in animal extracellular matrices.

Answer:

A. Cellulose