DP Chemistry (last assessment 2024)

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Question 18M.3.sl.TZ2.16a.i

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Date May 2018 Marks available [Maximum mark: 2] Reference code 18M.3.sl.TZ2.16a.i
Level sl Paper 3 Time zone TZ2
Command term Describe Question number a.i Adapted from N/A
a.i.
[Maximum mark: 2]
18M.3.sl.TZ2.16a.i

Penicillins and aspirin are important medicines.

(a.i)

Describe how penicillin combats bacterial infections.

[2]

Markscheme

«irreversibly» binds/bonds to enzyme/transpeptidase

OR

inhibits enzyme/transpeptidase «in bacteria» that produces cell walls

OR

prevents cross-linking of bacterial cell walls

 

cells absorb water AND burst

OR

cells cannot reproduce

 

[2 marks]

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