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Question 20N.3.SL.TZ0.17b

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Date November 2020 Marks available [Maximum mark: 2] Reference code 20N.3.SL.TZ0.17b
Level SL Paper 3 Time zone TZ0
Command term Explain Question number b Adapted from N/A
b.
[Maximum mark: 2]
20N.3.SL.TZ0.17b
(b)

Explain how Helicobacter pylori can cause stomach ulcers.

[2]

Markscheme

a. H. pylori weakens/degrades the mucous coating;

b. (this) allows acid to get through to the epithelial layer;

c. the acid damages the stomach wall;

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