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Question 19N.3.sl.TZ0.18b

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Date November 2019 Marks available [Maximum mark: 2] Reference code 19N.3.sl.TZ0.18b
Level sl Paper 3 Time zone TZ0
Command term Discuss Question number b Adapted from N/A
b.
[Maximum mark: 2]
19N.3.sl.TZ0.18b

Infectious diseases can be caused by bacteria or viruses.

(b)

Discuss two difficulties, apart from socio-economic factors, associated with finding a cure for AIDS.

[2]

Markscheme

Any two of:
HIV difficult to detect/remains dormant ✔

HIV mutates rapidly/quickly ✔
NOTE: Do not accept “AIDS mutates” without mention of the HIV/virus.

HIV replicates rapidly/quickly ✔

HIV destroys «T-» helper cells/white blood cells/lymphocytes
OR
HIV attacks immune system ✔

HIV has several «significantly different» strains/subtypes ✔

NOTE: Accept “virus” for “HIV”.
Penalize the use of “AIDS” for “HIV” once only.
Accept “HIV metabolism linked to that of host cell” OR “drugs harm host cell as well as HIV”.

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