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Question 18N.3.sl.TZ0.8b

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Date November 2018 Marks available [Maximum mark: 1] Reference code 18N.3.sl.TZ0.8b
Level sl Paper 3 Time zone TZ0
Command term Outline Question number b Adapted from N/A
b.
[Maximum mark: 1]
18N.3.sl.TZ0.8b

Lactose, found in milk and dairy products, is a disaccharide formed from two different monosaccharides. The structure of lactose is shown with numbered carbon atoms.

(b)

Outline how the two monomer structures, galactose and glucose, differ.

[1]

Markscheme

H and OH are reversed/in different positions on C-4 ✔

 

C-4 must be specified.

Do not penalize if reference is made to H and OH above and below ring/in alpha and beta positions on C-4 incorrectly.

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