Revision Past Paper Questions Organisation

Question 1

Suggest how an infection with helicobacter pylori might result in a stomach ulcer developing (2)

Answer 1

Bacteria isn’t killed by HCL
HCL damages stomach tissue causing an ulcer

Question 2

Symptom of coeliac disease include poor growth

Suggest why a person with coeliac disease may have this symptom (4)

Answer 2

Villi will have a smaller surface area and can’t absorb food molecules as much
(so) fewer amino acid and glucose is absorbed
less glucose means transfer and energy from respiration is reduced
(and) fewer amino acids available to build new proteins

Question 3

What is a drug? (1)

Answer 3

A chemical that affects the bodies chemical reaction

Question 4

“Lactase is normally produced in the stomach of mammals”

Explain why this isn’t true? (2)

Answer 4

Ph is stomach in low so lactase works best in non acidic conditions

Question 5

Bile helps the dine dti on of lipids in milk

Describe how (2)

Answer 5

Bile emulsifies lipids
Bile is alkaline

Question 6

Explain why the balloons inflate when the flexible rubber sheet is pulled down (3)

Answer 6

Volume increases
Pressure decreases
And aid enters balloon