DP Chemistry (last assessment 2024)

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Question 20N.3.sl.TZ0.5c

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Date November 2020 Marks available [Maximum mark: 2] Reference code 20N.3.sl.TZ0.5c
Level sl Paper 3 Time zone TZ0
Command term Describe Question number c Adapted from N/A
c.
[Maximum mark: 2]
20N.3.sl.TZ0.5c
(c)

Proteins are polymers of amino acids.

Describe how the tertiary structure differs from the quaternary structure in hemoglobin.

[2]

Markscheme

tertiary: folding/shape of a single «polypeptide/protein» chain ✔

quaternary: arrangement/folding of four/several chains/proteins/polypeptides «held together by IMF» ✔


Accept “two or more polypeptides” for M2.

Examiners report

Many candidates didn't understand the question and provided long answers referring to the interactions but failing to identify those took place within the same/one chain. More candidates were able to score the second mark referring to multiple chains.

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