DP Chemistry (last assessment 2024)

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Question 18N.3.sl.TZ0.12c

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Date November 2018 Marks available [Maximum mark: 1] Reference code 18N.3.sl.TZ0.12c
Level sl Paper 3 Time zone TZ0
Command term Outline Question number c Adapted from N/A
c.
[Maximum mark: 1]
18N.3.sl.TZ0.12c

The structure of penicillin is shown in section 37 of the data booklet.

(c)

Outline one effect of over-prescription of penicillin.

[1]

Markscheme

Any one of:

leads to «bacterial» resistance «to antibiotics»

OR

makes antibiotics less effective

OR

increased side effects due to larger dosages/over time ✔

 

increases proportion of resistant bacteria ✔

 

destroys useful/beneficial bacteria

OR

destroyed bacteria replaced by more harmful bacteria ✔

 

resistant bacteria pass on their mutation to next generation ✔

damage to ecosystems ✔

 

Accept “superbugs such as MRSA develop” but superbug must be identified.

Accept “immune” for resistant but do not accept “tolerance”

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