DP Chemistry (last assessment 2024)

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Question 18M.3.sl.TZ1.b

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Date May 2018 Marks available [Maximum mark: 2] Reference code 18M.3.sl.TZ1.b
Level sl Paper 3 Time zone TZ1
Command term Explain Question number b Adapted from N/A
b.
[Maximum mark: 2]
18M.3.sl.TZ1.b

Polymers of α-glucose include the disaccharide maltose and the polysaccharide amylose, a type of starch. The cyclic structure of α-glucose is shown in section 34 of the data booklet.

A person with diabetes suffering very low blood sugar (hypoglycaemia) may be advised to consume glucose immediately and then eat a small amount of starchy food such as a sandwich. Explain this advice in terms of the properties of glucose and starch.

[2]

Markscheme

Glucose:

readily passes through intestine wall/dissolves in blood

OR

is immediately available for energy/respiration

OR

transported rapidly around body

 

Starch:

must be hydrolysed/broken down «into smaller molecules» first

[2 marks]

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