# Describe the differences in the structure and function of starch and cellulose, explaining how their chemical properties affect their roles in plants.

> OCR A-Level Biology A (H420) — 2.2 Biological molecules · Describe · 4 marks

## Mark scheme (4 marks)

1. identification of starch as a carbohydrate composed of glucose molecules with alpha glycosidic bonds
2. identification of cellulose as a carbohydrate composed of glucose molecules with beta glycosidic bonds
3. description of the role of starch in plant cells, including its function as an energy storage molecule
4. description of the role of cellulose in plant cells, including its function in providing structural support

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