BU1 2016

Question 1

Name the part of a pancreatic cell that produces the active form of trypsin

Answer 1

Ribosome

Question 2

Suggest the advantage of producing trypsin in an inactive form inside cells in the pancreas

Answer 2

Doesnt digest protein inside cells so cell not destroyed

Question 3

Smoking causes changes in the lungs and airways of smokers
Suggest two changes in the lungs of people who continue to smoke that could explain the change in their FEV1

Answer 3

Excess mucus
Inflammation

Question 4

The scientists told the volunteers to drink the milk first thing in the morning rather than at bedtime

Answer 4

Would be aware of symptoms

Question 5

Glucose is absorbed from the lumen of the small intestine into epithelial cells
Explain how the transport of sodium ions is involved in the absorption of glucose by epithelial cells

Answer 5

Na+ions leave epithelial cell and enter blood
Transport by active transport using ATP
So Na+ conc in cell is lower than in lumen
Na+ ions enter by facilitated diffusion
Glucose absorbed with Na+ ions against their conc gradient