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Question 18M.3.HL.TZ1.19d

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Date May 2018 Marks available [Maximum mark: 2] Reference code 18M.3.HL.TZ1.19d
Level HL Paper 3 Time zone TZ1
Command term Explain Question number d Adapted from N/A
d.
[Maximum mark: 2]
18M.3.HL.TZ1.19d
(d)

Many animals, including humans, maintain strongly acidic conditions in part of their digestive systems. Explain two benefits of this to the animal.

[2]

Markscheme

a. provides ideal pH for stomach enzyme activity 

b. (acidic conditions) denature proteins /start breakdown of other organic substances 

c. (acidic conditions) convert pepsinogen (inactive) into pepsin 

d. (acidic conditions) destroy pathogens in ingested food

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