DP Chemistry (last assessment 2024)

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Question 19N.3.hl.TZ0.15b

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Date November 2019 Marks available [Maximum mark: 2] Reference code 19N.3.hl.TZ0.15b
Level hl Paper 3 Time zone TZ0
Command term Compare and contrast Question number b Adapted from N/A
b.
[Maximum mark: 2]
19N.3.hl.TZ0.15b
(b)

Compare and contrast the structures of starch and cellulose.

One similarity:

One difference:

[2]

Markscheme

One similarity:
1−4/glycosidic linkage
OR
glucose monomers/residues ✔

NOTE: Accept “both are polysaccharides”.

One difference:
starch has α-glucose AND cellulose has β-glucose «monomers»
OR
starch can form coiled/spiral/helical chains «and straight chains» AND cellulose cannot/can only form straight chains/can only form a linear structure
OR
starch «in amylopectin» also has 1−6 glycosidic links AND cellulose does not ✔

NOTE: Accept "cellulose has alternate glucose monomers upside down with respect to each other AND starch does not".

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