Answer
A
Work Step by Step
Option B is incorrect. Actin is a protein found in muscles.
Option C is incorrect. Cellulose is a polymer made of glucose subunits and forms the cell walls of plants.
Option D is incorrect. Starch is a polymer made of glucose subunits and is used in plants for carbohydrate storage.
Option A is correct. Chitin is a carbohydrate polymer that forms the cell walls of fungi as well as the exoskeleton of insects.
