DP Chemistry (last assessment 2024)

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Question 19M.3.sl.TZ1.15b(ii)

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Date May 2019 Marks available [Maximum mark: 1] Reference code 19M.3.sl.TZ1.15b(ii)
Level sl Paper 3 Time zone TZ1
Command term Outline Question number b(ii) Adapted from N/A
b(ii).
[Maximum mark: 1]
19M.3.sl.TZ1.15b(ii)

Staphylococcus aureus (S. aureus) infections have been successfully treated with penicillin and penicillin derivatives.

(b(ii))

Outline how the structure of penicillin has been modified to overcome this resistance.

[1]

Markscheme

side-chain changed «preserving beta-lactam ring»  [✔]

 

Note: Accept “R group changed”.

Examiners report

Most students were also aware that changing to the side chain of penicillin is often used to counter resistance, though many benefitted from the decision to accept “R-” without any mention of the data booklet structure.

Syllabus sections