1.1. Monoglycerides are molecules made up of glycerol and one fatty acid tail. They are absorbed into the epithelial cells of the small intestine by diffusion across the cell membrane.

Some people suffer from coeliac disease that affects the lining of their small intestine.

The diagram compares the lining of the small intestine of a healthy person and a person suffering from coeliac disease.

Based on the information provided, explain the effect that coeliac disease would have on the absorption of monoglycerides.

1.2. The graph shows the rate of uptake of monoglycerides in the small intestine.

Describe and explain what the graph shows.

1.3. Human body temperature is approximately 37 °C, which provides the optimum temperature for activity of protein molecules such as enzymes. 

Suggest why a temperature of 37 °C helps to maximise the rate of transport of substances across the cell membrane.