DP Chemistry (first assessment 2025)

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Question 23M.2.HL.TZ2.20

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Date May 2023 Marks available [Maximum mark: 2] Reference code 23M.2.HL.TZ2.20
Level HL Paper 2 Time zone TZ2
Command term Suggest Question number 20 Adapted from N/A
20.
[Maximum mark: 2]
23M.2.HL.TZ2.20

Suggest two reasons why the penicillin side-chain is modified.

[2]

Markscheme

bacterial resistance «to older penicillin’s/antibiotics» ✓

prevent penicillinase/beta-lactamase/enzyme in bacterium to deactivate/open penicillin/beta-lactam ring ✓

 

Accept “antibiotic resistant bacteria” but not “antibiotic resistance” for M1.

Accept “reduce allergic reactions from penicillin” for M2.

Award [1 max] for "increased efficiency/bioavailability"
OR
"increased stability in GIT".

Do not accept "bacterial tolerance".