DP Chemistry (last assessment 2024)

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Question 18N.3.sl.TZ0.15b

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Date November 2018 Marks available [Maximum mark: 2] Reference code 18N.3.sl.TZ0.15b
Level sl Paper 3 Time zone TZ0
Command term Outline Question number b Adapted from N/A
b.
[Maximum mark: 2]
18N.3.sl.TZ0.15b

Viruses and bacteria both cause diseases and are frequently confused.

(b)

Outline two different ways in which antiviral medications work.

[2]

Markscheme

Any two of:

prevents virus attaching to host cell ✔

alters cell’s genetic material/DNA «so that virus cannot use it to multiply» ✔

blocks enzyme activity in the host cell «so that virus cannot use it to multiply» ✔

prevents removal of protein coat/capsid ✔

prevents injection of viral DNA/RNA into cell ✔

prevents release of «replicated» viruses from host cell ✔

 

Accept “prevents synthesis of virus by host cell”.

Accept “alters RNA/DNA/genetic material of virus”.

Do not accept just “mimics nucleotides”.

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