Which of the following polysaccharides is composed of repeating units of glucose and xylose, and is found in the cell walls of plants?

A Cellulose
B Chitin
C Glycogen
D Xylan ✓

Explanation

Xylan is a polysaccharide composed of repeating units of glucose and xylose, and is found in the cell walls of plants.

Source

Berg et al. Biochemistry
Carbohydrate Metabolism Biochemistry Polysaccharides Hard MEDICAL Confidence: high